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
32,763 results · Feed
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Medium 6.5
WordPress Blocksy Companion plugin <= 2.1.60 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Creative Themes Blocksy Companion blocksy-companion allows Stored XSS.This issue affects Blocksy Companion: from n/a through 2.1.60.
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High 8.9
Chamilo LMS: Stored XSS in public user-profile fields
Chamilo LMS is an open-source learning management system. From 2.0.0 until 2.0.1, `GET /user/{username}` is anonymously reachable and renders six user-editable profile fields (`firstname`, `lastname`, `competences`, `openarea`, `teach`, and `diplomas`) inside…
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Medium 6.1
Netsweeper < 4.0.11 / 4.1.5 Reflected XSS via view_server_log.php
Netsweeper before 4.0.11 and 4.1.0 before 4.1.5 contains a reflected cross-site scripting vulnerability in webadmin/reporter/view_server_log.php that allows remote attackers to execute arbitrary JavaScript by injecting malicious code through the log request p…
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Critical 9.9
SOCFortress CoPilot: Stored comment and SOC-field XSS permits privileged account takeover
SOCFortress CoPilot focuses on providing a single pane of glass for all your security operations needs. In affected snapshots preceding the respective 0.1.70 and 0.1.76 sink repairs, portal users, including `customer_user`, can submit stored markup through `P…
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High 8.5
Stored Cross-Site Scripting (XSS) in SharePoint Manager Plus Chart Feature
A stored cross-site scripting (XSS) vulnerability exists in the chart feature of SharePoint Manager Plus (SPMP) due to improper sanitization and HTML encoding of user-controlled data. An attacker can inject malicious HTML or JavaScript into attributes used to…
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Medium 5.1
Stored XSS in Protectel
ARKETEAM Protectel modules PROTECTELMAJ and BDF contain a note editor module vulnerable to Stored XSS. A low privileged attacker can inject arbitrary HTML and JS into notes, which will be rendered/executed when a user visits this module. This issue has been f…
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Medium 5.4
phpMyAdmin through 5.2.3 Stored XSS via Designer Query History Table Name
phpMyAdmin through 5.2.3 contains a stored cross-site scripting vulnerability that allows database users with CREATE privilege to inject script via unescaped table names in DesignerHistory.display(). Attackers can create a table whose name contains HTML marku…
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High 8.7
Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID
A Cross-Site Scripting (XSS) (CWE-79) vulnerability in the auth/handler in Google Cloud Identity Platform and Firebase Authentication versions prior to 2026-08-14 on iOS allows an unauthenticated remote attacker to execute arbitrary JavaScript using a malicio…
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High 7.2
Food Store <= 1.5.5 - Unauthenticated Stored Cross-Site Scripting via 'service_time' Cookie
The Food Store – Online Food Delivery & Pickup plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'service_time' parameter in all versions up to, and including, 1.5.5 due to insufficient input sanitization and output escaping. This make…
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High 7.2
Gravity Forms <= 3.1.2 - Unauthenticated Stored Cross-Site Scripting via List Field
The Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via List Field in all versions up to, and including, 3.1.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to …
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High 7.2
Gravity Forms <= 3.1.1 - Unauthenticated Stored Cross-Site Scripting via Post Excerpt / Post Custom Field / Rich-Text Paragraph Field Values
The Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Post Excerpt / Post Custom Field / Rich-Text Paragraph Field Values in all versions up to, and including, 3.1.1 due to insufficient input sanitization and output escaping.…
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Medium 6.8
Firelight Lightbox < 2.3.23 - Contributor+ Stored XSS via Lightbox Link 'href' Attribute
The Firelight Lightbox WordPress plugin before 2.3.23 does not escape the URL of links it opens in its Classic lightbox before inserting it into the page as HTML, which could allow users with a role as low as Contributor to perform Stored Cross-Site Scripting…
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High 8.8
WP Visitor Statistics (Real Time Traffic) < 8.8 - Unauthenticated Stored XSS via Tracker Device Parameters
The WP Visitor Statistics (Real Time Traffic) WordPress plugin before 8.8 does not sanitize and escape tracking data derived from public visitor requests before storing it and outputting it in the administrative statistics dashboard, allowing unauthenticated …
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Medium 6.8
Joinchat 6.3.2 - 6.4.1 - Author+ Stored XSS via Button Block Message Attribute
The Joinchat WordPress plugin before 6.4.2 does not escape the message of its button block before outputting it in an HTML attribute on the front end, which could allow users with the Author role and above to perform Stored Cross-Site Scripting attacks agains…
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Medium 4.7
WP User Frontend < 4.3.14 - Reflected XSS via 'field_attr' Parameter
The User Frontend WordPress plugin before 4.3.14 does not sanitise and escape some user-supplied values before reflecting them into HTML attributes in a publicly reachable AJAX response, leading to Reflected Cross-Site Scripting. The affected action is gated …
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Medium 6.4
Events Made Easy <= 3.3.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'width' Shortcode Attribute
The Events Made Easy plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'width' parameter in all versions up to, and including, 3.3.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated a…
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Medium 6.4
Cool FormKit Lite <= 2.7.9 - Authenticated (Contributor+) Stored DOM-Based Cross-Site Scripting via Form Field custom_id Parameter
The Cool FormKit Lite – Advanced Form Builder for Elementor plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the '_elementor_data.form_fields[].custom_id' parameter in all versions up to, and including, 2.7.9 due to insufficient…
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Medium 5.4
MathJax: LaTeX for Drupal - Critical - Cross site scripting - SA-CONTRIB-2026-195
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal MathJax: LaTeX for Drupal allows Cross-Site Scripting (XSS). This issue affects MathJax: LaTeX for Drupal versions: from 0.0.0 to 4.1.2.
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Medium 5.4
Leaflet - Moderately critical - Cross site scripting - SA-CONTRIB-2026-204
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Leaflet allows Stored XSS. This issue affects Leaflet versions: from 0.0.0 to 10.4.13.
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Low 3.8
Menu Link Attributes - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-209
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Menu Link Attributes allows Stored XSS. This issue affects Menu Link Attributes versions: from 0.0.0 to 1.8.0.
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Low 3.1
Country - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-211
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Country allows Cross-Site Scripting (XSS). This issue affects Country versions: from 0.0.0 to 2.1.3, from 2.2.0 to 2.2.1.
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Medium 6.5
Gin Admin Theme - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-219
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Gin Admin Theme allows Cross-Site Scripting (XSS). This issue affects Gin Admin Theme versions: from 0.0.0 to 4.1.4, from 5.0.0 to 5.0.16.
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Medium 6.5
Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-015
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 8.9.0 to 10.6.19, from 11.0.0 to 11.3.19, from 11.4.0 to …
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Medium 6.5
Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-016
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 10.3.0 to 10.6.19, from 11.0.0 to 11.3.19, from 11.4.0 to…
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High 7.1
UI Icons - Critical - Cross site scripting - SA-CONTRIB-2026-221
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal UI Icons allows Cross-Site Scripting (XSS). This issue affects UI Icons versions: from 0.0.0 to 1.1.3, from 2.0.0 to 2.0.2.
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High 7.1
Zero Point - Critical - Cross-site scripting - SA-CONTRIB-2026-222
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Zero Point allows Stored XSS. This issue affects Zero Point versions: from 0.0.0 to 1.30.0, from 2.0.0 to 2.0.1.
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High 7.1
Black Hole - Critical - Cross-site scripting - SA-CONTRIB-2026-223
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Black Hole allows Stored XSS. This issue affects Black Hole versions: from 0.0.0 to 1.26.0, from 2.0.0 to 2.0.1.
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High 7.1
ABC - Critical - Cross-site scripting - SA-CONTRIB-2026-224
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal ABC allows Stored XSS. This issue affects ABC versions: from 0.0.0 to 1.25.0, from 2.0.0 to 2.0.1.
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Medium 6.5
CSV Field - Moderately critical - Cross site Scripting - SA-CONTRIB-2026-226
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal CSV Field allows Stored XSS. This issue affects CSV Field versions: from 0.0.0 to 2.0.10, from 3.0.0 to 3.0.7.
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Medium 6.5
Swiper formatter - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-228
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Swiper formatter allows Stored XSS. This issue affects Swiper formatter versions: from 0.0.0 to 2.1.2, from 3.0.1 to 3.1.0.
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Medium 6.5
Sector Distribution - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-229
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Sector Distribution allows Stored XSS. This issue affects Sector Distribution versions: from 0.0.0 to 10.3.3, from 10.4.0 to 10.4.2.
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Medium 6.5
UI Icons - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-230
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal UI Icons allows Cross-Site Scripting (XSS). This issue affects UI Icons versions: from 0.0.0 to 1.1.3, from 2.0.0 to 2.0.2.
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Medium 5.9
Block Attributes - Moderately critical - Cross site Scripting - SA-CONTRIB-2026-232
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Block Attributes allows Stored XSS. This issue affects Block Attributes versions: from 0.0.0 to 2.1.0.
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Medium 6.5
USWDS Paragraph Components - Moderately critical - Cross site scripting - SA-CONTRIB-2026-234
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal USWDS Paragraph Components allows Stored XSS. This issue affects USWDS Paragraph Components versions: from 0.0.0 to 3.1.3.
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High 7.1
Bootstrap - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-236
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Bootstrap allows Cross-Site Scripting (XSS). This issue affects Bootstrap versions: from 0.0.0 to 3.45.0.
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Low 3.5
Data field - Moderately critical - Cross site scripting - SA-CONTRIB-2026-250
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Data field allows Stored XSS. This issue affects Data field versions: from 0.0.0 to 2.0.14.
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Medium 5.1
Commerce Stripe - Moderately critical - Cross site scripting - SA-CONTRIB-2026-265
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Commerce Stripe allows Cross-Site Scripting (XSS). This issue affects Commerce Stripe versions: from 2.0.0 to 2.2.3.
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Medium 6.5
AI (Artificial Intelligence) - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-266
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal AI (Artificial Intelligence) allows Cross-Site Scripting (XSS). This issue affects AI (Artificial Intelligence) versions: from 0.0.0 to 1.4.11, from 1…
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Medium 6.5
AI (Artificial Intelligence) - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-267
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal AI (Artificial Intelligence) allows Cross-Site Scripting (XSS). This issue affects AI (Artificial Intelligence) versions: from 0.0.0 to 1.4.11, from 1…
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High 7.1
AI (Artificial Intelligence) - Critical - Cross-site scripting - SA-CONTRIB-2026-269
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal AI (Artificial Intelligence) allows Cross-Site Scripting (XSS). This issue affects AI (Artificial Intelligence) versions: from 0.0.0 to 1.4.11, from 1…