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
591 results · Clear filters · Feed
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Critical 9.0
MindsDB Cross-site Scripting vulnerability
A cross-site scripting (XSS) vulnerability exists in all versions of the MindsDB platform, enabling the execution of a JavaScript payload whenever a user enumerates an ML Engine, database, project, or dataset containing arbitrary JavaScript code within the we…
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Critical 9.7
Joplin has a parsing error leading to Cross-site Scripting (XSS)
Joplin is a free, open source note taking and to-do application. Joplin fails to take into account that "<" followed by a non letter character will not be considered html. As such it is possible to do an XSS by putting an "illegal" tag within a tag.
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Critical 9.8CVE-2024-45265 Public exploit
A SQL injection vulnerability in the poll component in SkySystem Arfa-CMS before 5.1.3124 allows remote attackers to ex…
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Critical 9.6
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Forcepoint Web Se…
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Critical 9.1CVE-2024-43400 Public exploit
XWiki Platform allows XSS through XClass name in string properties
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. It is possible for a user without Script or Programming rights to craft a URL pointing to a page with arbitrary JavaScript. This requires social engineer …
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Critical 9.3
Azure Stack Hub Spoofing Vulnerability
Azure Stack Hub Spoofing Vulnerability
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Critical 9.8
AMTT Hotel Broadband Operation System (HiBOS) V3.0.3.151204 and before is vulnerable to SQL Injection via /manager/card…
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Critical 9.1
VR Overlay RCE
VRCX is an assistant/companion application for VRChat. In versions prior to 2024.03.23, a CefSharp browser with over-permission and cross-site scripting via overlay notification can be combined to result in remote command execution. These vulnerabilities are …
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Critical 9.8
An Unrestricted file upload vulnerability was found in "/Membership/edit_member.php" of Kashipara Live Membership Syste…
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Critical 9.8
Long pressing on a download link could potentially allow Javascript commands to be executed within the browser This vul…
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Critical 10.0
Inproper Sanitation of field leading to stored XSS
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea Gitea Open Source Git Server allows Stored XSS.This issue affects Gitea Open Source Git Server: 1.22.0.
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Critical 9.6CVE-2024-28739 EPSS 19%
An issue in Koha ILS 23.05 and before allows a remote attacker to execute arbitrary code via a crafted script to the fo…
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Critical 9.3
A Cross-Site Scripting vulnerability in rcmail_action_mail_get->run() in Roundcube through 1.5.7 and 1.6.x through 1.6.…
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Critical 9.3
A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to ste…
KEV Jun 9, 2025 -
Critical 9.1CVE-2024-41947 Public exploit
XWiki Platform XSS through conflict resolution
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. By creating a conflict when another user with more rights is currently editing a page, it is possible to execute JavaScript snippets on the side of the ot…
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Critical 9.6
Whale browser before 3.26.244.21 allows an attacker to execute malicious JavaScript due to improper sanitization when p…
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Critical 9.7
Jupyter Server Proxy has a reflected XSS issue in host parameter
Jupyter Server Proxy allows users to run arbitrary external processes alongside their notebook server and provide authenticated web access to them. Versions of 3.x prior to 3.2.4 and 4.x prior to 4.2.0 have a reflected cross-site scripting (XSS) issue. The `/…
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Critical 9.0
Cross-site scripting vulnerability in Cybozu Garoon 5.0.0 to 5.15.2 allows a remote authenticated attacker with an admi…
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Critical 9.6
A deep link validation issue in KakaoTalk 10.4.3 allowed a remote adversary to direct users to run any attacker-control…
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Critical 9.6
An arbitrary file upload vulnerability in the Upload function of Box-IM v2.0 allows attackers to execute arbitrary code…
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Critical 9.8
An arbitrary file upload vulnerability in KYKMS v1.0.1 and below allows attackers to execute arbitrary code via uploadi…
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Critical 9.7
PrestaShop vulnerable to XSS via customer contact form in FO, through file upload
PrestaShop is an open source e-commerce web application. A cross-site scripting (XSS) vulnerability that only affects PrestaShops with customer-thread feature flag enabled is present starting from PrestaShop 8.1.0 and prior to PrestaShop 8.1.6. When the custo…
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Critical 9.7CVE-2024-34070 Public exploit
Froxlor Vulnerable to Blind XSS Leading to Froxlor Application Compromise
Froxlor is open source server administration software. Prior to 2.1.9, a Stored Blind Cross-Site Scripting (XSS) vulnerability was identified in the Failed Login Attempts Logging Feature of the Froxlor Application. An unauthenticated User can inject malicious…
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Critical 9.1
SQL Injection vulnerability in School Task Manager v.1.0 allows a remote attacker to obtain sensitive information via a…
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Critical 9.6
A cross-site scripting (XSS) vulnerability in the Settings section of WonderCMS v3.4.3 allows attackers to execute arbi…
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Critical 9.6
A cross-site scripting (XSS) in Cosmetics and Beauty Product Online Store v1.0 allows attackers to execute arbitrary we…
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Critical 9.6
Cross Site Scripting (XSS) vulnerability in Form Tools 3.1.1 allows attackers to run arbitrary code via the client_id p…
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Critical 9.0
SiYuan 3.0.3 - RCE via Server Side XSS
SiYuan version 3.0.3 allows executing arbitrary commands on the server. This is possible because the application is vulnerable to Server Side XSS.
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Critical 9.0
Cross Site Scripting vulnerability in Campcodes Online Marriage Registration System v.1.0 allows a remote attacker to e…
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Critical 9.1
Cross-site scripting on application summary component in argo-cd
Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Due to the improper URL protocols filtering of links specified in the `link.argocd.argoproj.io` annotations in the application summary component, an attacker can achieve cross-site scri…
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Critical 9.1
NextChat vulnerable to Server-Side Request Forgery and Cross-site Scripting
NextChat, also known as ChatGPT-Next-Web, is a cross-platform chat user interface for use with ChatGPT. Versions 2.11.2 and prior are vulnerable to server-side request forgery and cross-site scripting. This vulnerability enables read access to internal HTTP e…
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Critical 9.6
Cross Site Scripting (XSS) vulnerability in Teamwire Windows desktop client v.2.0.1 through v.2.4.0 allows a remote att…
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Critical 9.6
Cross Site Scripting vulnerability in Teamwire Windows desktop client v.2.0.1 through v.2.4.0 allows a remote attacker …
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Critical 9.6CVE-2024-25292 Public exploit
Cross-site scripting (XSS) vulnerability in RenderTune v1.1.4 allows attackers to execute arbitrary web scripts or HTML…
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Critical 9.0
Liferay Portal Document and Media widget and Liferay DXP vulnerable to stored Cross-site Scripting
Stored cross-site scripting (XSS) vulnerability in the Document and Media widget in Liferay Portal 7.4.3.18 through 7.4.3.101, and Liferay DXP 2023.Q3 before patch 6, and 7.4 update 18 through 92 allows remote authenticated users to inject arbitrary web scrip…
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Critical 9.8CVE-2024-1676 EPSS 18%
Inappropriate implementation in Navigation in Google Chrome prior to 122.0.6261.57 allowed a remote attacker to spoof s…
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Critical 9.0
Liferay Portal and Liferay DXP vulnerable to reflected Cross-site Scripting
Reflected cross-site scripting (XSS) vulnerability in the instance settings for Accounts in Liferay Portal 7.4.3.44 through 7.4.3.97, and Liferay DXP 2023.Q3 before patch 6, and 7.4 update 44 through 92 allows remote attackers to inject arbitrary web script o…
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Critical 9.6
Liferay Portal Language Override edit screen and Liferay DXP vulnerable to reflected Cross-site Scripting
Reflected cross-site scripting (XSS) vulnerability in the Language Override edit screen in Liferay Portal 7.4.3.8 through 7.4.3.97, and Liferay DXP 2023.Q3 before patch 5, and 7.4 update 4 through 92 allows remote attackers to inject arbitrary web script or H…
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Critical 9.6
Liferay Portal Frontend JS module's portlet.js and Liferay DXP vulnerable to Cross-site Scripting
Cross-site scripting (XSS) vulnerability in the Frontend JS module's portlet.js in Liferay Portal 7.2.0 through 7.4.3.37, and Liferay DXP 7.4 before update 38, 7.3 before update 11, 7.2 before fix pack 20, and older unsupported versions allows remote attacker…
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Critical 9.0
Liferay Portal and Liferay DXP vulnerable to stored Cross-site Scripting
Multiple stored cross-site scripting (XSS) vulnerabilities in Liferay Portal 7.2.0 through 7.4.3.13, and older unsupported versions, and Liferay DXP 7.4 before update 10, 7.3 before update 4, 7.2 before fix pack 17, and older unsupported versions allow remote…