Weakness (CWE)
CWE-79: Cross-site Scripting
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
How to prevent it (8 mitigations)
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Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and Apache Wicket.
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Implementation, Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages. Study all expected communication protocols and data representations to determine the required encoding strategies.
For any data that will be output to another web page, especially any data that was received from external inputs, use the appropriate encoding on all non-alphanumeric characters.
Parts of the same output document may require different encodings, which will vary depending on whether the output is in the:
- HTML body
- Element attributes (such as src="XYZ")
- URIs
- JavaScript sections
- Cascading Style Sheets and style property
etc. Note that HTML Entity Encoding is only appropriate for the HTML body.
Consult the XSS Prevention Cheat Sheet [REF-724] for more details on the types of encoding and escaping that are needed.
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Architecture and Design, Implementation
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
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Architecture and Design
If available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
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Implementation
Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.
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Implementation
With Struts, write all data from form beans with the bean's filter attribute set to true.
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Implementation
To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XmlHttpRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.
Source: MITRE CWE-79
32,753 results · Feed
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Medium 6.4
wpForo Forum <= 3.2.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Reply Body in Moderation Forms
The wpForo Forum plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'post[body]' parameter in all versions up to, and including, 3.2.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated …
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Medium 6.4
WPSpeed <= 2.6.10 - Authenticated (Subscriber+) Stored Cross-Site Scripting via User Nickname/Display Name
The WPSpeed plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.6.10 This is due to a combination of two issues in the LightImages HTML optimizer: (1) Dispatcher::runOptimize() decides whether the current requ…
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Medium 5.4
Zephyr Project Manager <= 3.3.209 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'zpm_profile_picture' Parameter
The Zephyr Project Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'zpm_profile_picture' parameter in all versions up to, and including, 3.3.209 due to insufficient input sanitization and output escaping. This makes it possib…
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Medium 6.5
WordPress The Events Calendar plugin <= 6.18.3 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Liquid Web / StellarWP The Events Calendar the-events-calendar allows Stored XSS.This issue affects The Events Calendar: from n/a through 6.18.3.
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Medium 6.5
WordPress Contact Form 7 – Post Fields plugin <= 2.6.0 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Markus Wiesenhofer Contact Form 7 – Post Fields cf7-post-fields allows Stored XSS.This issue affects Contact Form 7 – Post Fields: from n/a throu…
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Medium 6.5
WordPress MC Woocommerce Wishlist plugin <= 2.0.3 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Saeed MC Woocommerce Wishlist smart-wishlist-for-more-convert allows Stored XSS.This issue affects MC Woocommerce Wishlist: from n/a through 2.0.3.
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Medium 6.5
WordPress WP Recipe Maker plugin <= 10.9.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Bootstrapped Ventures WP Recipe Maker wp-recipe-maker allows Stored XSS.This issue affects WP Recipe Maker: from n/a through 10.9.1.
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Medium 6.5
WordPress WCFM Marketplace plugin <= 3.8.3 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WC Lovers WCFM Marketplace wc-multivendor-marketplace allows Stored XSS.This issue affects WCFM Marketplace: from n/a through 3.8.3.
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High 7.2
TranslatePress <= 3.3.8 - Unauthenticated Stored Cross-Site Scripting via Comment Attribute via trp-ajax.php Dictionary Endpoint
The TranslatePress – Translate Multilingual sites with AI Translation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment (storage); originals / language / original_language (exfiltration from endpoint)' parameter in all version…
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Medium 6.4
aBlocks <= 2.18.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'headingTag' Block Attribute
The aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'headingTag' parameter in all versions up to, and including, 2.18.0 due to insuff…
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High 7.2
Strong Testimonials <= 3.3.16 - Unauthenticated Stored Cross-Site Scripting via 'star_rating' Parameter
The Strong Testimonials plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'star_rating' parameter in all versions up to, and including, 3.3.16 due to insufficient input sanitization and output escaping. This makes it possible for unaut…
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Medium 6.4
WP Data Access <= 5.5.90 - Authenticated (Subscriber+) Stored Cross-Site Scripting via TEXT-family Column Value in Front-end Data Project Form
The WP Data Access – App Builder for Tables, Forms, Dashboards, Charts & Maps plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Data Projects front-end simple form in versions up to, and including, 5.5.90 This is due to insufficient in…
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High 7.2
AgenWebsite Shipping <= 9.2.41 - Unauthenticated Stored Cross-Site Scripting via 'zipcode' Parameter via Setup Wizard
The AgenWebsite Shipping – Plugin Ongkos Kirim & Generate Resi Otomatis Semua Kurir Indonesia plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'zipcode' parameter in all versions up to, and including, 9.2.41 due to insufficient input …
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Medium 6.4
WP Data Access <= 5.5.89 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'Image URL' Media-Type Column Renderer
The WP Data Access – App Builder for Tables, Forms, Dashboards, Charts & Maps plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ImageURL column value (populated from wp_usermeta.description in the demonstrated path)' parameter in all …
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Medium 6.4
SEOPress <= 10.3 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'seopress_google_analytics_affiliate_tracking' and 'seopress_google_analytics_download_tracking' Parameters
The SEOPress – AI SEO Plugin & On-site SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'seopress_google_analytics_affiliate_tracking' and 'seopress_google_analytics_download_tracking' settings in versions up to, and including, 10…
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Medium 6.4
WP Data Access <= 5.5.89 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Autocomplete Lookup Label
The WP Data Access plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Simple Form autocomplete lookup label in versions up to, and including, 5.5.89 This is due to insufficient output escaping on the value returned by WPDA_Autocomplete:…
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Medium 6.4
Ultimate Member <= 2.14.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Custom Textarea Profile Field
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'pm_note (any custom Textarea metakey with html disabled)' parameter i…
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High 7.2
Unlimited Elements for Elementor <= 2.0.26 - Unauthenticated Stored Cross-Site Scripting via RSS Feed Widget
The Unlimited Elements for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '<title>/<description> inside the attacker-controlled RSS feed body' parameter in all versions up to, and including, 2.0.26 due to insufficient inpu…
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Medium 6.8
Add From Server Reloaded < 6.0.0 - Author+ Stored XSS via SVG Upload
The Add From Server Lite WordPress plugin before 6.0.0 does not restrict SVG uploads to users allowed to post unfiltered HTML, allowing users with the Author role and above to upload SVG files containing JavaScript and perform Stored XSS attacks.
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Medium 6.8
Live Composer < 2.1.23 - Contributor+ Stored XSS via Post Module Pagination
The Live Composer WordPress plugin before 2.1.23 does not escape a pagination setting supplied through its post-listing module shortcodes before outputting it in an HTML attribute, allowing users with the Contributor role and above to perform Stored Cross-Sit…
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High 7.5
FV Player < 7.5.57.7212 - Unauthenticated Stored XSS via Comment Popup
The FV Flowplayer Video Player WordPress plugin before 7.5.57.7212 does not escape shortcode attribute values embedded in comments before rendering them into the media player markup, allowing an unauthenticated visitor to store a script payload in a comment t…
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Low 3.5
Live Composer < 2.1.23 - Admin+ Stored XSS via Partner Slug
The Live Composer WordPress plugin before 2.1.23 does not sanitise and escape some of its custom post type slug settings before using them in front-end links, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks …
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High 8.7
Multiple Vulnerabilities in IBM API Connect
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to execute arbitrary JavaScript due to cross-site scripting. HTML content supplied by a provider is not sufficiently sanitized before it is di…
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Medium 5.4
Multiple Vulnerabilities in IBM API Connect
IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to execute arbitrary scripts due to improper neutralization of user-controlled input.
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Medium 5.4
Multiple Vulnerabilities in IBM API Connect
IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to perform cross-site scripting due to improper neutralization of user-supplied input.
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Critical 9.9
Multiple Vulnerabilities in IBM API Connect
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to execute arbitrary JavaScript and obtain sensitive information due to improper input validation.
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Medium 5.4
Multiple Vulnerabilities in IBM API Connect
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to execute arbitrary scripts due to cross-site scripting. Certain URL fields are not sufficiently validated, so malicious script content could…
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Medium 6.4
Redux Framework <= 4.5.16 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Color Scheme Name
The Redux Framework plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'content' parameter in all versions up to, and including, 4.5.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated…
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High 7.2
TranslatePress <= 3.3.8 - Unauthenticated Stored Cross-Site Scripting via Comment Content via trp-gettext Marker Smuggling and PCRE Backtrack Bypass
The TranslatePress – Translate Multilingual sites with AI Translation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 3.3.8 due to insufficient input sanitization and output e…
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Medium 6.4
Stackable <= 3.19.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'save' Parameter
The Stackable – Page Builder Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'update_block_style' endpoint in all versions up to, and including, 3.19.9 due to insufficient input sanitization and output escaping. This…
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Medium 4.7
Stop Spammers Classic <= 2026.6 - Unauthenticated Stored Cross-Site Scripting via 'author' Parameter
The Stop Spammers Classic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'author' POST parameter in versions up to, and including, 2026.6. An unauthenticated POST handled on init stores the attacker-supplied author field (after sani…
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Medium 6.4
Soledad <= 8.7.7 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Social Profile Fields
The Soledad theme for WordPress is vulnerable to Stored Cross-Site Scripting via Social Profile Fields in all versions up to, and including, 8.7.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, …
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High 7.2
Pie Register <= 3.8.4.16 - Unauthenticated Stored Cross-Site Scripting via 'first_name' Parameter via Comment Avatar
The Pie Register – User Registration, Profiles & Content Restriction plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'first_name' parameter in all versions up to, and including, 3.8.4.16 due to insufficient input sanitization and out…
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High 7.2
Optimole <= 4.2.18 - Unauthenticated Stored Cross-Site Scripting via Comment Content
The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.2.18 due to insufficient input sa…
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Medium 6.1
QODE Wishlist for WooCommerce <= 1.2.9 - Unauthenticated Stored Cross-Site Scripting via 'table_title' Shared Wishlist Field via Guest Cookie
The QODE Wishlist for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'qode_wishlist_for_woocommerce_guests_items' parameter in all versions up to, and including, 1.2.9 due to insufficient input sanitization and output es…
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High 7.2
Optimole <= 4.2.18 - Unauthenticated Stored Cross-Site Scripting via Page Profiler srcset Descriptor
The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 's (missing_srcsets[*][*].s)' parameter in all versions up to, and including, 4.2.18 due to i…
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Medium 5.4
Greenshift <= 13.2.2 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Interaction Layer attach-attribute to Counter data-prefix
The Greenshift – animation and page builder blocks plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'url (comment_author_url)' parameter in all versions up to, and including, 13.2.2 due to insufficient input sanitization and…
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High 7.2
iubenda | All-in-one Compliance for GDPR / CCPA Cookie Consent + more <= 3.13.6 - Unauthenticated Stored Cross-Site Scripting via Comment Content via IUB-COOKIE-BLOCK Marker
The iubenda | All-in-one Compliance for GDPR / CCPA Cookie Consent + more plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.13.6. This is due to the way iubendaParser::parse_comments() re-processes HTML insi…
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High 7.2
Flying Images: Optimize and Lazy Load Images for Faster Page Speed <= 2.4.15 - Unauthenticated Stored Cross-Site Scripting via Comment Content
The Flying Images: Optimize and Lazy Load Images for Faster Page Speed plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 2.4.15 due to insufficient input sanitization and output…
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Medium 6.4
Kubio AI Page Builder <= 2.9.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via kubio/shortcode Block via Product Review
The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment (review body)' parameter in all versions up to, and including, 2.9.4 due to insufficient input sanitization and output escaping. This makes it possibl…