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
6,268 results · Clear filters · Feed
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High 8.6
SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a maliciou…
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High 8.5
Stored cross-site scripting in Pending Changes sidebar
Stored cross-site scripting (XSS) in Checkmk version 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create pending changes to inject malicious JavaScript into the Pending Changes sidebar, which will execute in the browsers of other …
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High 8.6
XSS in Unified Search via Unescaped Host/Service Names
Stored cross-site scripting (XSS) in Checkmk 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create hosts or services to execute arbitrary JavaScript in the browsers of other users performing searches in the Unified Search feature.
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High 7.2
Query Monitor <= 3.20.3 - Reflected Cross-Site Scripting via Request URI
The Query Monitor – The developer tools panel for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘$_SERVER['REQUEST_URI']’ parameter in all versions up to, and including, 3.20.3 due to insufficient input sanitization an…
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High 8.7
Stored Cross-site Scripting (XSS) vulnerability affecting Factory Resource Management in DELMIA Factory Resource Manager from Release 3DEXPERIENCE R2023x through Release 3DEXPERIENCE R2025x
A Stored Cross-site Scripting (XSS) vulnerability affecting Factory Resource Management in DELMIA Factory Resource Manager from Release 3DEXPERIENCE R2023x through Release 3DEXPERIENCE R2025x allows an attacker to execute arbitrary script code in user's brows…
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High 8.7
Stored Cross-site Scripting (XSS) vulnerability affecting Document Management in ENOVIA Collaborative Industry Innovator from Release 3DEXPERIENCE R2023x through Release 3DEXPERIENCE R2025x
A Stored Cross-site Scripting (XSS) vulnerability affecting Document Management in ENOVIA Collaborative Industry Innovator from Release 3DEXPERIENCE R2023x through Release 3DEXPERIENCE R2025x allows an attacker to execute arbitrary script code in user's brows…
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High 7.1
baserCMS: Multiple vulnerabilities in baserCMS
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has DOM-based cross-site scripting in tag creation. This issue has been patched in version 5.2.3.
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High 7.4
Tautulli: Unsanitized JSONP callback parameter allows cross-origin script injection and API key theft
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. From version 1.3.10 to before version 2.17.0, an unsanitized JSONP callback parameter allows cross-origin script injection and API key theft. This issue has been patched in version…
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High 8.2
Express XSS Sanitizer: allowedTags/allowedAttributes bypass leads to permissive sanitization (XSS risk)
Express XSS Sanitizer is Express 4.x and 5.x middleware which sanitizes user input data (in req.body, req.query, req.headers and req.params) to prevent Cross Site Scripting (XSS) attack. A vulnerability has been identified in versions prior to 2.0.2 where res…
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High 8.6
Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop, a cross-site scripting vulnerability stored in the note history comparison viewer can escalate to remote code execution in a desktop application. The issue is triggered when an attacker-c…
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High 8.3
Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options
Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the Handlebars CLI precompiler (`bin/handlebars` / `lib/precompiler.js`) concatenates user-controlled strings — template file names and several CLI…
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High 7.3
Home Assistant has stored XSS in history-graphs
Home Assistant is open source home automation software that puts local control and privacy first. Starting in version 2025.02 and prior to version 2026.01 the "remaining charge time"-sensor for mobile phones (imported/included from Android Auto it appears) is…
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High 7.3
Home Assistant has stored XSS in Map-card through malicious device name
Home Assistant is open source home automation software that puts local control and privacy first. Starting in version 2020.02 and prior to version 2026.01, an authenticated party can add a malicious name to their device entity, allowing for Cross-Site Scripti…
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High 8.2
AVideo Vulnerable to Reflected XSS via Unsanitized plugin Parameter in YPTWallet Stripe Payment Page
WWBN AVideo is an open source video platform. In versions up to and including 26.0, the YPTWallet Stripe payment confirmation page directly echoes the `$_REQUEST['plugin']` parameter into a JavaScript block without any encoding or sanitization. The `plugin` p…
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High 7.0
Langflow - Stored XSS via Malicious SVG Upload
The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content. Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary …
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High 7.7
PrestaShop has multiple stored XSS vulnerabilities via unprotected Template variables
PrestaShop is an open source e-commerce web application. Versions prior to 8.2.5 and 9.1.0 are vulnerable to stored Cross-Site Scripting (stored XSS) vulnerabilities in the BO. An attacker who can inject data into the database, via limited back-office access …
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High 7.3
Kestra Vulnerable to Stored Cross-Site Scripting via Flow YAML Fields
Kestra is an open-source, event-driven orchestration platform Versions up to and including 1.3.3 render user-supplied flow YAML metadata fields — description, inputs[].displayName, inputs[].description — through the Markdown.vue component instantiated with ht…
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High 7.2
Fluent Booking <= 2.0.01 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters
The Fluent Booking plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple parameters in all versions up to, and including, 2.0.01 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated at…
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High 8.2
WebOfisi E-Ticaret 4.0 SQL Injection via urun Parameter
WebOfisi E-Ticaret 4.0 contains an SQL injection vulnerability in the 'urun' GET parameter of the endpoint that allows unauthenticated attackers to manipulate database queries. Attackers can inject SQL payloads through the 'urun' parameter to execute boolean-…
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High 7.2
Blackhole for Bad Bots <= 3.8 - Unauthenticated Stored Cross-Site Scripting via User-Agent HTTP Header
The Blackhole for Bad Bots plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the User-Agent HTTP header in all versions up to and including 3.8. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_t…
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High 7.6
OpenEMR has Stored XSS in CCDA Preview via Unsanitized linkHtml Attributes
OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0.3, a stored cross-site scripting vulnerability in the CCDA document preview allows an attacker who can upload or send a CCDA docume…
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High 8.7
OpenEMR has Stored XSS in patient encounter Eye Exam form $CHRONIC2 and $CHRONIC3
OpenEMR is a free and open source electronic health records and medical practice management application. Users with the `Notes - my encounters` role can fill Eye Exam forms in patient encounters. The answers to the form are displayed on the encounter page and…
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High 7.1
WordPress OOPSpam Anti-Spam plugin <= 1.2.62 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in OOPSpam Team OOPSpam Anti-Spam oopspam-anti-spam allows Stored XSS.This issue affects OOPSpam Anti-Spam: from n/a through <= 1.2.62.
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High 7.1
WordPress Taboola Pixel plugin <= 1.1.4 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Taboola Taboola Pixel taboola-pixel allows Reflected XSS.This issue affects Taboola Pixel: from n/a through <= 1.1.4.
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High 7.1
WordPress Fusion Builder plugin < 3.15.0 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeFusion Fusion Builder fusion-builder allows Reflected XSS.This issue affects Fusion Builder: from n/a through < 3.15.0.
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High 7.1
WordPress Bookly plugin <= 26.7 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Bookly Bookly bookly-responsive-appointment-booking-tool allows Reflected XSS.This issue affects Bookly: from n/a through <= 26.7.
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High 7.1
WordPress Molla theme < 1.5.19 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in don-themes Molla molla allows Reflected XSS.This issue affects Molla: from n/a through < 1.5.19.
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High 7.1
WordPress Contact Form & Lead Form Elementor Builder plugin <= 2.0.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeHunk Contact Form & Lead Form Elementor Builder lead-form-builder allows Stored XSS.This issue affects Contact Form & Lead Form Elementor Builder: from …
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High 7.1
WordPress Abandoned Cart Recovery for WooCommerce plugin <= 1.1.10 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in VillaTheme Abandoned Cart Recovery for WooCommerce woo-abandoned-cart-recovery allows Stored XSS.This issue affects Abandoned Cart Recovery for WooCommerce: …
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High 7.1
WordPress Riode | Multi-Purpose WooCommerce theme < 1.6.29 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in don-themes Riode riode allows Reflected XSS.This issue affects Riode: from n/a through < 1.6.29.
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High 7.1
WordPress Contact Manager plugin <= 9.1 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kleor Contact Manager contact-manager allows Reflected XSS.This issue affects Contact Manager: from n/a through <= 9.1.
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High 7.1
WordPress Gaea theme < 3.8 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in imithemes Gaea gaea allows Reflected XSS.This issue affects Gaea: from n/a through < 3.8.
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High 7.1
WordPress Image Slider by Ays plugin <= 2.7.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Ays Pro Image Slider by Ays ays-slider allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Image Slider by Ays: from n…
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High 7.1
WordPress JobSearch plugin <= 3.2.0 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in eyecix JobSearch wp-jobsearch allows Reflected XSS.This issue affects JobSearch: from n/a through <= 3.2.0.
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High 7.1
WordPress Wolverine Framework plugin <= 1.9 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in G5Theme Wolverine Framework wolverine-framework allows Reflected XSS.This issue affects Wolverine Framework: from n/a through <= 1.9.
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High 7.1
WordPress Darna Framework plugin <= 2.9 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in G5Theme Darna Framework darna-framework allows Reflected XSS.This issue affects Darna Framework: from n/a through <= 2.9.
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High 7.1
WordPress Penci Soledad Data Migrator plugin <= 1.3.1 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PenciDesign Penci Soledad Data Migrator penci-data-migrator allows Reflected XSS.This issue affects Penci Soledad Data Migrator: from n/a through <= 1.3.1.
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High 7.1
WordPress Listeo Core plugin <= 2.0.21 - Reflected Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in purethemes Listeo Core listeo-core allows Reflected XSS.This issue affects Listeo Core: from n/a through <= 2.0.21.
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High 7.1
WordPress Remoji plugin <= 2.2 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPDO Remoji remoji allows Stored XSS.This issue affects Remoji: from n/a through <= 2.2.
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High 7.1
WordPress Booking calendar, Appointment Booking System plugin <= 3.2.36 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in wpdevart Booking calendar, Appointment Booking System booking-calendar allows Stored XSS.This issue affects Booking calendar, Appointment Booking System: fro…