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
32,779 results · Feed
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Medium 6.5
WordPress All-in-One Video Gallery plugin <= 4.9.7 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Plugins360 Labs All-in-One Video Gallery all-in-one-video-gallery allows Stored XSS.This issue affects All-in-One Video Gallery: from n/a through 4.9.7.
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High 7.1
WordPress W3 Total Cache plugin <= 2.10.7 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Bold Grid W3 Total Cache w3-total-cache allows Stored XSS.This issue affects W3 Total Cache: from n/a through 2.10.7.
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High 7.1
WordPress WP Event Solution plugin <= 4.1.26 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Arraytics WP Event Solution wp-event-solution allows Stored XSS.This issue affects WP Event Solution: from n/a through 4.1.26.
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High 7.1CVE-2026-112869 Public exploit
WordPress We’re Open! plugin <= 2.6 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Noah Hearle We’re Open! opening-hours allows Reflected XSS.This issue affects We’re Open!: from n/a through 2.6.
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High 7.1
WordPress BP Better Messages plugin <= 3.1.3 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in wordplus BP Better Messages bp-better-messages allows DOM-Based XSS.This issue affects BP Better Messages: from n/a through 3.1.3.
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Medium 6.8
WP VR 8.5.49 - 9.0.2 - Contributor+ Stored XSS via Hotspot Content
The WPVR WordPress plugin before 9.0.3 does not properly sanitise and escape some of its tour hotspot content before storing it and outputting it on the front end, which could allow users with the Contributor role and above to perform Stored Cross-Site Script…
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Medium 6.8
GeoDirectory < 2.8.194 - Contributor+ Stored XSS via gd_map Shortcode width Attribute
The GeoDirectory WordPress plugin before 2.8.194 does not sanitise and escape some of its map shortcode attributes before outputting them within a style attribute, allowing users with the Contributor role and above to perform Stored Cross-Site Scripting attac…
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Medium 6.8
Pixel Tag Manager for WooCommerce < 2.2.3 - Contributor+ Stored XSS via Google Tag Manager Container ID
The Pixel Tag Manager for WooCommerce WordPress plugin before 2.2.3 does not perform a capability check in one of its AJAX actions, and exposes the nonce protecting it to any user able to access the admin dashboard, allowing users with a role as low as Contri…
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High 7.1
Download Monitor < 5.3.4 - Reflected XSS via Cross-Origin Download Link
The Download Monitor WordPress plugin before 5.3.4 does not properly validate that a clicked link belongs to the site before fetching it client-side and rendering part of the response in the page, which allows unauthenticated attackers to execute arbitrary Ja…
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Low 2.1
Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body
Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. Prior to 7.1.3, the function-source escaping logic does not neutralize a bare closing-script prefix when attacker-influenced function sour…
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Medium 6.1
odf-kit has HTML injection leading to XSS in odsToHtml() via unescaped style attribute values
### Summary ODF style values are interpolated into `style="..."` attributes without HTML-escaping in odf-kit's ODS to-HTML renderer (`odsToHtml()`). A double-quote character inside an attacker-controlled style value breaks out of the attribute, allowing arbit…
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High 8.3
Improper sanitization in the registration module allows reflected Cross-Site Scripting.
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High 8.6
Joomla Extension - phoca.cz - Authenticated stored cross-site scripting through HTML attribute injection in Phoca Gallery 4.5.0 - 6.1.5
Joomla Extension - phoca.cz - Authenticated stored cross-site scripting through HTML attribute injection in Phoca Gallery 4.5.0 - 6.1.5
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Critical 9.3
Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation and reflected XSS
The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From version 25.08 to before version 26.05, the IIIF Auth 2.0 endpoints auth/login and auth/token in AuthorizationFlowResource accept an origin query parame…
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Medium 5.4
GFI Archiver < 15.14 Stored XSS via MailInsights.aspx
GFI Archiver before 15.14 contains a stored cross-site scripting vulnerability in the MailInsights scheduled report configuration that allows authenticated attackers to inject arbitrary web script or HTML via the report name parameter to /Archiver/MailInsight…
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High 7.1
baserCMS: Unauthenticated Stored XSS via Shortcode Expansion in Blog Comments
baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, global shortcode expansion runs over the complete rendered page, including HTML-escaped blog comments supplied by unauthenticated visitors. A comment containin…
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Medium 6.1
Zimbra Collaboration Suite Pre-Authentication Reflected Cross-Site Scripting via Login Page zrememberme Parameter
A reflected cross-site scripting vulnerability in the login page of Zimbra Collaboration Suite (ZCS) allows an unauthenticated attacker to execute JavaScript through the zrememberme parameter. A crafted relogin URL selects a two-factor error display that inse…
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Medium 5.4
Zimbra Collaboration Suite Briefcase CSS Sanitization Bypass via Non-ASCII Stylesheet Characters
A CSS sanitization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user with Briefcase access to publish a document that displays attacker-controlled content under the Zimbra origin. When processing a stylesheet containing non-ASCII …
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Medium 4.7
serialize-javascript 7.0.1 before 7.1.3 XSS via unescaped </script in function body
serialize-javascript from 7.0.1 before 7.1.3 contains a cross-site scripting vulnerability that allows attackers to break out of HTML script elements by ending serialized function source text with an unescaped </script. Attackers controlling a function's sour…
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High 8.7
Zimbra Collaboration Suite Classic Web Client Reflected Cross-Site Scripting via Document Editor Packages Parameter
A reflected cross-site scripting vulnerability in the Classic Web Client of Zimbra Collaboration Suite (ZCS) allows an attacker to inject JavaScript through the packages parameter of the /h/rest document editor. The editor inserts package names into script at…
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High 7.1
WordPress Hostme v2 theme <= 7.0 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in AivahThemes Hostme v2 hostmev2 allows DOM-Based XSS.This issue affects Hostme v2: from n/a through 7.0.
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High 7.1
WordPress KALLYAS theme <= 4.25.0 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Hogash KALLYAS kallyas allows Reflected XSS.This issue affects KALLYAS: from n/a through 4.25.0.
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Medium 4.6
conda-forge.org: Stored DOM XSS via unsanitized dangerouslySetInnerHTML in the status dashboard
conda-forge is a GitHub organization containing repositories of conda recipes. In commits 85748ad2368a and prior, two React components render externally-sourced strings directly as HTML using dangerouslySetInnerHTML, with no sanitization (the project has no D…
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High 8.8
PraisonAI: HTTPApproval dashboard renders tool arguments as raw HTML, allowing approval-page XSS to approve dangerous tools
PraisonAI is a multi-agent teams system. From version 4.5.2 to before version 4.6.59, praisonai.bots.HTTPApproval renders pending tool approval arguments directly into the approval dashboard HTML. An attacker-controlled tool argument can inject JavaScript int…
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Medium 5.1
Reflected Cross-Site Scripting (XSS) in CGM CLININET
CGM CLININET is vulnerable to Reflected Cross-Site Scripting (XSS) due to improper neutralization of user-supplied data. A remote unauthenticated attacker can craft a malicious URL containing JavaScript or HTML code, which is executed in the victim's browser …
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High 7.1
WordPress VikRentCar plugin <= 1.4.8 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in e4jvikwp VikRentCar vikrentcar allows Reflected XSS.This issue affects VikRentCar: from n/a through 1.4.8.
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High 7.1
WordPress VikRentCar plugin <= 1.4.8 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in e4jvikwp VikRentCar vikrentcar allows Stored XSS.This issue affects VikRentCar: from n/a through 1.4.8.
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Medium 5.1
Stored Cross-Site Scripting in OrderAdministration Portal (AuftragsManager) via Business Reference in VertiGIS WebOrderSystem
The "ASMobile" web interface, which is part of the VertiGIS software package "GIS Portal", allows authenticated users to define a business reference. JavaScript code can be inserted into this field. On its own this only affects the user who entered it (self-X…
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Medium 5.1
Reflected Cross-Site Scripting in CustomerAdministration Portal (KundenManager)in VertiGIS WebOrderSystem
The CustomerAdministration portal (KundenManager) of VertiGIS WebOrderSystem allows privileged users to search for employees across all defined companies (user groups). The search term can be passed in the "searchValue" URL parameter, so the search is perform…
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Medium 4.8
Stored Cross-Site Scripting in CustomerAdministration Portal (KundenManager) in VertiGIS WebOrderSystem
The CustomerAdministration portal (KundenManager) of VertiGIS WebOrderSystem allows privileged users to manage the employees of defined companies (user groups). User properties, for example the "secondName" parameter, can be filled with JavaScript code while …
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Medium 6.8
Advanced Custom Fields: Extended 0.8.9.4 - 0.9.2.7 - Contributor+ XSS via Form Shortcode Attributes
The Advanced Custom Fields: Extended WordPress plugin before 0.9.2.8, Advanced Custom Fields: Extended PRO WordPress plugin before 0.9.2.8 does not validate or escape some of its form shortcode attributes, which can be pointed at values taken from the visitor…
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High 7.5
LiteSpeed Cache < 7.9.2 - Unauthenticated Stored XSS via Font Display Optimization
The LiteSpeed Cache WordPress plugin before 7.9.2 does not limit one of its HTML optimization routines to stylesheet content, so it can delete the markup that closes an attribute in the rendered page, and combined with unescaped comment author output this all…
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High 7.5
LiteSpeed Cache < 7.9.2 - Unauthenticated Stored XSS via CDN Inline CSS Rewriting
The LiteSpeed Cache WordPress plugin before 7.9.2 does not restrict one of its HTML rewriting routines to stylesheet content, so it removes a quote that terminates an attribute in the rendered page, and combined with unescaped comment author output this allow…
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Medium 6.8
Profile Builder < 4.0.5 - Contributor+ Stored XSS via redirect_url Shortcode Attribute
The User Profile Builder WordPress plugin before 4.0.5 does not sanitise and escape one of its shortcode attributes before outputting it back in a redirect message, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripti…
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Low 3.5
Speed Optimizer < 7.8.5 - Admin+ Stored XSS via DNS Prefetch and Font Preload URL Lists
The Speed Optimizer WordPress plugin before 7.8.5 does not sanitise or escape some of its settings before outputting them in the head of front-end pages, which could allow high-privilege users such as admins to perform Stored Cross-Site Scripting attacks even…
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High 7.5
Otter Blocks < 3.2.8 - Unauthenticated Stored XSS via Dynamic Content Render Filter
The Otter Blocks WordPress plugin before 3.2.8 does not correctly bound a pattern it uses to rewrite its dynamic-content tokens while rendering blocks, so the pattern can consume the quote that closes an HTML attribute and pull adjacent unescaped data into th…
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Medium 6.8
Otter Blocks < 3.2.8 - Contributor+ Stored XSS via Block Style Attributes
The Otter Blocks WordPress plugin before 3.2.8 does not properly sanitize and escape user-supplied block styling values before writing them into an inline stylesheet, allowing users with contributor-level access and above to inject arbitrary web scripts that …
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High 7.2
Anti-Spam by CleanTalk <= 6.89.1 - Unauthenticated Stored Cross-Site Scripting via 'user_email' Registration Parameter
The Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 6.89.1 due to insufficient input sanitization and output escapi…
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Medium 5.4
Part-DB: SVG Sanitization Bypass via Extension Spoofing Leads to Stored XSS in Attachment Viewer
Part-DB is an open source inventory management system for electronic components. Prior to version 2.12.3, Part-DB-server sanitizes SVG files based solely on the user-controlled filename extension rather than actual file content type. An authenticated attacker…
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Medium 5.7
Part-DB: Stored HTML injection in BOM validation results via unescaped Part name
Part-DB is an open source inventory management system for electronic components. Prior to version 2.12.2, Part-DB renders BOM validation information messages using Twig's |raw filter. These messages include translated placeholders populated with user-controll…