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
32,780 results · Feed
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Medium 5.4
Quay: quay: dom-based cross-site scripting via oauth local callback format=json parameter
A flaw was found in Quay. A cross-site scripting (XSS) vulnerability in the OAuth callback handler allows a remote attacker to execute arbitrary JavaScript code within a user's browser session. By tricking a logged-in user into visiting a specially crafted li…
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Medium 5.3
Joomla Extension - joomshaper.com - Reflected XSS in the Dynamic Content Filter addon in SP Page Builder Pro 3.0.0 - 5.6.1p2
Joomla Extension - joomshaper.com - Reflected XSS in the Dynamic Content Filter addon in SP Page Builder Pro 3.0.0 - 5.6.1p2 - The slider minimum and maximum values are taken from the dc_filter_<fieldId> request parameter, split on the delimiter "l-r", HTML-e…
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Medium 5.4
LearnPress WordPress Plugin through 4.4.9.1 Stored XSS via Quiz Question Hint and Explanation
LearnPress plugin for WordPress through 4.4.9.1 contains a stored cross-site scripting vulnerability that allows authenticated instructors to inject scripts via quiz question hint and explanation fields. Attackers with the Instructor role can submit unsanitiz…
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Medium 4.3
feelec-yishu feelcrm-os Department Search Endpoint GroupController.class.php index cross site scripting
A vulnerability was identified in feelec-yishu feelcrm-os 1.0.0. This vulnerability affects the function GroupController::index of the file App/Feelcrm/Index/Controller/GroupController.class.php of the component Department Search Endpoint. The manipulation of…
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Medium 5.6
Stored XSS vulnerability in OAuth configuration form
The email media type OAuth form passes the Authorization endpoint value to window.open() without validating the URL scheme, so a javascript: URL is executed in the browser. This means a crafted media type configuration, deliverable as an import file, runs arb…
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Low 3.5
feelec-yishu feelcrm-os Create Customer Endpoint CrmDefineFormModel.class.php htmlspecialchars_decode cross site scripting
A vulnerability was found in feelec-yishu feelcrm-os 1.0.0. Affected by this issue is the function htmlspecialchars_decode of the file App/Feelcrm/Common/Model/CrmDefineFormModel.class.php of the component Create Customer Endpoint. Performing a manipulation o…
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Medium 4.3
feelec-yishu feelcrm-os Crm Endpoint functions.php index cross site scripting
A vulnerability has been found in feelec-yishu feelcrm-os 1.0.0. Affected by this vulnerability is the function IndexController::index of the file App/ThinkPHP/Common/functions.php of the component Crm Endpoint. Such manipulation of the argument redirect_url …
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Medium 6.5
WordPress Starter Templates plugin <= 4.7.7 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Brainstorm Force Starter Templates astra-sites allows Stored XSS.This issue affects Starter Templates: from n/a through 4.7.7.
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Medium 6.5
WordPress Name Directory plugin <= 1.34.2 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Jeroen Peters Name Directory name-directory allows Stored XSS.This issue affects Name Directory: from n/a through 1.34.2.
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Medium 6.5
WordPress Presto Player plugin <= 4.5.2 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Brainstorm Force Presto Player presto-player allows Stored XSS.This issue affects Presto Player: from n/a through 4.5.2.
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Medium 6.5
WordPress Premium Addons for Elementor plugin <= 4.11.109 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in LeapWorx Premium Addons for Elementor premium-addons-for-elementor allows Stored XSS.This issue affects Premium Addons for Elementor: from n/a through 4.11.1…
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Medium 6.5
WordPress Logo Showcase plugin <= 4.0.4 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Themepoints Logo Showcase logo-showcase allows Stored XSS.This issue affects Logo Showcase: from n/a through 4.0.4.
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Medium 6.5
WordPress MP3 Audio Player for Music, Radio & Podcast by Sonaar plugin <= 5.14.2 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Sonaar MP3 Audio Player for Music, Radio & Podcast by Sonaar mp3-music-player-by-sonaar allows Stored XSS.This issue affects MP3 Audio Player for Music, Radi…
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Medium 6.5
WordPress eCommerce Product Catalog plugin <= 3.6.2 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in impleCode eCommerce Product Catalog ecommerce-product-catalog allows Stored XSS.This issue affects eCommerce Product Catalog: from n/a through 3.6.2.
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Medium 6.5
WordPress QR Redirector plugin <= 2.0.5 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Nikki Blight QR Redirector qr-redirector allows Stored XSS.This issue affects QR Redirector: from n/a through 2.0.5.
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Medium 6.5
WordPress GiveWP plugin <= 4.17.0 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Liquid Web / StellarWP GiveWP give allows Stored XSS.This issue affects GiveWP: from n/a through 4.17.0.
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Low 1.9
Mitel MiVoice Office 400 stored Cross-Site Scripting
DigitalCanion has discovered a stored Cross-Site Scripting (XSS) vulnerability that allows an authenticated malicious user to inject persistent JavaScript or HTML content, resulting in a denial-of-service condition within the web application. The specific fla…
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Low 1.9
Mitel MiVoice Office 400 stored Cross-Site Scripting
DigitalCanion has discovered a stored Cross-Site Scripting (XSS) vulnerability that allows an authenticated malicious user to inject persistent JavaScript or HTML content into the web application. The specific flaw exists within the web portal listening on TC…
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Medium 6.5
WordPress B Blocks plugin <= 2.1.8 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in bPlugins B Blocks b-blocks allows Stored XSS.This issue affects B Blocks: from n/a through 2.1.8.
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Medium 6.5
WordPress Image Photo Gallery Final Tiles Grid plugin <= 3.6.13 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Chill Image Photo Gallery Final Tiles Grid final-tiles-grid-gallery-lite allows Stored XSS.This issue affects Image Photo Gallery Final Tiles Grid: from n…
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Low 3.5
code-projects Human Resource Management System Live Event History liveEventHistory.php cross site scripting
A vulnerability was found in code-projects Human Resource Management System 1.0. Affected by this vulnerability is an unknown functionality of the file /views/admin/liveEventHistory.php of the component Live Event History. The manipulation of the argument eve…
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Low 3.5
code-projects Human Resource Management Event Creation EventStore.php cross site scripting
A flaw has been found in code-projects Human Resource Management 1.0. This affects an unknown part of the file /humanresourcemanagementsystem/src/store/EventStore.php of the component Event Creation. Executing a manipulation of the argument eventSubject can l…
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Medium 6.1
Bacularis 5.4.0 - 6.5.1 is vulnerable to Cross Site Scripting (XSS) in the Organization name field.
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Medium 5.4
In Bacularis v1.0.0 - 6.5.1 when adding a new pool, the LabelFormat field allows for a Cross Site Scripting (XSS) paylo…
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High 7.8
Twine 2 Desktop through 2.12.0 Arbitrary Code Execution via Imported Story Files
Twine 2 desktop through 2.12.0 contains a cross-site scripting vulnerability in importStories() that executes markup from imported story files in the editor window. Attackers can craft a story file whose script calls the twineElectron openWithScratchFile IPC …
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High 8.7
WWBN AVideo 12.4 through 29.2.0 Stored XSS via Double-Encoded Video Title
WWBN AVideo 12.4 through 29.2.0 contains a stored cross-site scripting vulnerability that allows authenticated uploaders to inject HTML by submitting doubly-encoded entities in video titles. Because safeString() strips tags before decoding entities and runs t…
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High 8.7
WWBN AVideo through 29.2.0 Stored XSS via trailer1 in YouPHPFlix2 Templates
WWBN AVideo through 29.2.0 contains a stored cross-site scripting vulnerability that allows users with upload permission to inject script by setting a malicious video trailer1 URL. The value is rendered unescaped in YouPHPFlix2 templates and channel playlists…
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Medium 5.4
YesWiki before 4.6.7 Stored XSS via Bazar valeur Action
YesWiki before 4.6.7 contains a cross-site scripting vulnerability in the Bazar valeur action that allows page editors to inject script by rendering unescaped HTML fetched from a remote URL. Attackers can point tools/bazar/actions/valeur.php at a controlled s…
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High 7.1
WordPress Unlimited Elements For Elementor (Free Widgets, Addons, Templates) plugin <= 2.0.20 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Unlimited Elements Unlimited Elements For Elementor (Free Widgets, Addons, Templates) unlimited-elements-for-elementor allows Reflected XSS.This issue affect…
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High 7.1
WordPress WP Statistics plugin <= 14.16.14 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in VeronaLabs WP Statistics wp-statistics allows Reflected XSS.This issue affects WP Statistics: from n/a through 14.16.14.
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High 7.1
WordPress TranslatePress plugin <= 3.3.6 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Cozmoslabs TranslatePress translatepress-multilingual allows Stored XSS.This issue affects TranslatePress: from n/a through 3.3.6.
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High 7.1
WordPress Gutenberg Blocks by Kadence Blocks plugin <= 3.7.11.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Liquid Web / StellarWP Gutenberg Blocks by Kadence Blocks kadence-blocks allows Stored XSS.This issue affects Gutenberg Blocks by Kadence Blocks: from n/a th…
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Low 3.5
Simple Shopping Cart < 5.2.6 - Admin+ Stored XSS via PayPal API Credentials
The Simple Shopping Cart WordPress plugin before 5.2.6 does not escape some of its settings field values before outputting them on an admin settings page, allowing high-privilege users such as administrators to perform Stored Cross-Site Scripting attacks, whi…
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Medium 6.8
Horizontal Scrolling Announcements <= 2.6 - Contributor+ Stored XSS via Style Field
The Horizontal scrolling announcements WordPress plugin through 2.6 does not sanitise and escape one of its announcement settings before outputting it into an attribute context on the front end, allowing users granted access to the announcement management pag…
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Low 3.5
Omega Solution CoinEx Crypto Ticket Attachment Upload ticket cross site scripting
A weakness has been identified in Omega Solution CoinEx Crypto 2025. Affected by this vulnerability is an unknown functionality of the file /user/ticket of the component Ticket Attachment Upload. This manipulation causes cross site scripting. The attack is po…
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Medium 6.1
W (wcms) through 3.18.0 Unauthenticated Stored XSS via Login Username and Comments
W (vincent-peugnet/wcms) through 3.18.0 contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts via the login user field and visitor comment website field. Attackers can submit failed logins rendered unesca…
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High 7.1
WordPress Unlimited Elements For Elementor (Free Widgets, Addons, Templates) plugin <= 2.0.20 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Unlimited Elements Unlimited Elements For Elementor (Free Widgets, Addons, Templates) unlimited-elements-for-elementor allows Reflected XSS.This issue affect…
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Medium 6.1
OpenAM before 16.1.3 Latent XSS in SAML Load-Balancer Cookie Bounce Page
OpenAM before 16.1.3 contains a latent cross-site scripting defect that places the SAML message, relay state and target URL unencoded into the load-balancer cookie bounce auto-submit page. If reachable with cookieHashRedirectEnabled set, crafted requests coul…
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Medium 6.1
OpenAM before 16.1.3 Reflected XSS via OAuth2 Authorization Error Page
OpenAM before 16.1.3 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject script by supplying crafted parameters rendered unencoded on the OAuth2 authorization error page. Attackers can lure victims to a craf…
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Medium 6.4
Twenty20 Image Before-After <= 2.0.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'offset' Shortcode Attribute
The Twenty20 Image Before-After plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'offset' Shortcode Attribute in all versions up to, and including, 2.0.5 due to insufficient input sanitization and output escaping. This makes it possible f…