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
6,245 results · Clear filters · Feed
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High 8.4
Security Advisory 0185
A missing input validation vulnerability in the Fileserver upload API allows an authenticated attacker with file upload privileges to execute stored cross-site scripting (XSS). Successful exploitation could enable the attacker to hijack another CloudVision us…
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High 8.8
Unauthenticated Stored Cross-Site Scripting (XSS) Vulnerability in ClearPass Policy Manager Web-Based Management Interface
A vulnerability in the web-based management interface of ClearPass Policy Manager could allow an unauthenticated remote attacker to conduct a stored cross-site scripting (XSS) attack against an administrative user of the interface. A successful exploit could …
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High 7.6
NetBox 2.9.5 < 4.7.0 Session Hijacking via Custom Links
NetBox versions 2.9.5 before 4.7.0 contain a server-side template injection vulnerability that allows a low-privileged user with the "Can add custom links" permission to steal session cookies and API tokens of other users by exposing the raw Django HttpReques…
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High 8.4
MISP sachertortephp - CakeResponse::download() HTTP Response Splitting via Unsanitized Filename Enables Stored XSS
The CakeResponse::download() method in lib/Cake/Network/CakeResponse.php constructs a Content-Disposition header by directly interpolating a caller-supplied filename into a quoted-string value without sanitization. Two distinct injection vectors exist in the …
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High 8.3
Quasar Framework: App Vite SSR and SSG nonce attributes are not safely constrained
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 3.3.0, several @quasar/app-vite SSR and SSG rendering paths interpolated ssrContext.nonce directly into quoted HTML attributes. An application that derives or overr…
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High 7.1
Quasar Framework: SSR/SSG dev error page discloses the full shell environment and its </script> escape is bypassable
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to @quasar/render-ssr-error 2.2.4 and @quasar/app-vite 3.3.0, renderSSRError() in utils/render-ssr-error/src/index.js used diagnostic data from utils/render-ssr-error/…
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High 8.7
Payload: Bypassed sanitization of user uploaded SVGs
Payload is a free and open source headless content management system. In versions before 3.90.0 and canary versions before 4.0.0-canary.34, a collection that allows downloadable SVG uploads can store a malicious SVG that bypasses sanitization and executes att…
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High 8.7
SimpleChat: Stored XSS via group document filename in inline onclick handler
SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.261.029, POST /api/group_documents/upload stores an attacker-controlled group document filename that group_workspaces.html lat…
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High 7.1
WordPress WP Mailster plugin <= 1.9.0.0 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in WP Mailster <= 1.9.0.0 versions.
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High 7.1
WordPress Form Block plugin <= 1.8.1 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Form Block <= 1.8.1 versions.
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High 7.1
WordPress GiveWP plugin <= 4.17.0 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in GiveWP <= 4.17.0 versions.
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High 7.1
WordPress LearnPress plugin <= 4.4.9 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in LearnPress <= 4.4.9 versions.
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High 7.1
WordPress picu plugin <= 3.10.1 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in picu <= 3.10.1 versions.
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High 7.1
WordPress Charitable plugin <= 1.8.12.3 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Charitable <= 1.8.12.3 versions.
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High 7.1
WordPress Fluent Forms Pro Add On Pack plugin <= 6.2.13 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Fluent Forms Pro Add On Pack <= 6.2.13 versions.
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High 7.1
WordPress WP Cookie Notice for GDPR, CCPA & ePrivacy Consent plugin <= 4.4.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in WP Cookie Notice for GDPR, CCPA & ePrivacy Consent <= 4.4.6 versions.
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High 7.1
WordPress WooCommerce Simple Auctions plugin <= 3.0.10 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in WooCommerce Simple Auctions <= 3.0.10 versions.
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High 7.1
WordPress Social Rocket plugin <= 1.3.5 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Socialrocket Social Rocket social-rocket allows Reflected XSS.This issue affects Social Rocket: from n/a through 1.3.5.
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High 7.1
WordPress Video Background Block – Use video as background in the section. plugin <= 2.0.3 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Video Background Block – Use video as background in the section. <= 2.0.3 versions.
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High 7.1
WordPress CF7 Views – Complete Entry Management for Contact Form 7 plugin <= 3.2.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in CF7 Views – Complete Entry Management for Contact Form 7 <= 3.2.6 versions.
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High 7.1
WordPress Blog, Posts and Category Filter for Elementor plugin <= 2.1.0 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Blog, Posts and Category Filter for Elementor <= 2.1.0 versions.
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High 7.1
WordPress VikRentCar plugin <= 1.4.7 - 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 1.4.7.
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High 7.1
WordPress Document Gallery plugin <= 5.1.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Dan Rossiter Document Gallery document-gallery allows Reflected XSS.This issue affects Document Gallery: from n/a through 5.1.1.
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High 7.1
WordPress Hotel Booking plugin <= 3.8 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Hotel Booking <= 3.8 versions.
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High 7.1
WordPress Youzify plugin <= 1.3.7 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Youzify <= 1.3.7 versions.
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High 7.1
WordPress Ansar Import – One Click Starter Sites – for Elementor & Themes plugin <= 2.1.2 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Ansar Import – One Click Starter Sites – for Elementor & Themes <= 2.1.2 versions.
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High 7.1
WordPress ARForms plugin <= 7.1.2 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in ARForms <= 7.1.2 versions.
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High 7.1
WordPress Midtrans-WooCommerce plugin <= 2.32.3 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Midtrans-WooCommerce <= 2.32.3 versions.
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High 7.1
WordPress StoreGrowth: Smart Sales Booster for WooCommerce | BOGO, Upsells, Direct Checkout, Quick View, Side Cart plugin <= 2.0.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in StoreGrowth: Smart Sales Booster for WooCommerce | BOGO, Upsells, Direct Checkout, Quick View, Side Cart <= 2.0.6 versions.
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High 7.1
WordPress EduMall theme <= 4.5.3 - Reflected Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in EduMall <= 4.5.3 versions.
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High 7.1
WordPress Contact Form to DB by BestWebSoft plugin <= 1.7.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Contact Form to DB by BestWebSoft <= 1.7.6 versions.
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High 7.1
WordPress Database for CF7 plugin <= 1.2.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Database for CF7 <= 1.2.6 versions.
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High 7.1
WordPress Lumise Product Designer plugin < 2.1.4.1 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Lumise Lumise Product Designer lumise allows Reflected XSS.This issue affects Lumise Product Designer: from n/a before 2.1.4.1.
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High 7.1
WordPress HTTP Requests Manager plugin <= 1.3.11 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in HTTP Requests Manager <= 1.3.11 versions.
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High 7.1
WordPress Mapster WP Maps plugin <= 2.0.4 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Mapster WP Maps <= 2.0.4 versions.
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High 7.1
WordPress WPLMS theme <= 4.972 - Reflected Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in WPLMS <= 4.972 versions.
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High 7.1
WordPress Frontend File Manager plugin <= 23.6 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in Frontend File Manager <= 23.6 versions.
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High 7.1
WordPress SUMO Affiliates Pro plugin <= 11.7.0 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in SUMO Affiliates Pro <= 11.7.0 versions.
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High 7.1
WordPress Smart Forms plugin <= 2.6.104 - Cross Site Scripting (XSS) vulnerability
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EDGARROJAS Smart Forms smart-forms allows DOM-Based XSS.This issue affects Smart Forms: from n/a through 2.6.104.
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High 7.1
WordPress WP User Frontend Pro plugin <= 4.2.13 - Cross Site Scripting (XSS) vulnerability
Unauthenticated Cross Site Scripting (XSS) in WP User Frontend Pro <= 4.2.13 versions.