Common Weakness Enumeration
CWE-87
AllowedImproper Neutralization of Alternate XSS Syntax
Abstraction: Variant · Status: Draft
The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax.
98 vulnerabilities reference this CWE, most recent first.
CVE-2026-33510 (GCVE-0-2026-33510)
Vulnerability from cvelistv5 – Published: 2026-04-06 14:51 – Updated: 2026-04-06 15:41
VLAI
EPSS
VEX
Title
DOM-Based XSS in Homarr /auth/login Redirect
Summary
Homarr is an open-source dashboard. Prior to 1.57.0, a DOM-based Cross-Site Scripting (XSS) vulnerability has been discovered in Homarr's /auth/login page. The application improperly trusts a URL parameter (callbackUrl), which is passed to redirect and router.push. An attacker can craft a malicious link that, when opened by an authenticated user, performs a client-side redirect and executes arbitrary JavaScript in the context of their browser. This could lead to credential theft, internal network pivoting, and unauthorized actions performed on behalf of the victim. This vulnerability is fixed in 1.57.0.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/homarr-labs/homarr/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| homarr-labs | homarr |
Affected:
< 1.57.0
|
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CVE-2026-33506 (GCVE-0-2026-33506)
Vulnerability from cvelistv5 – Published: 2026-03-26 18:48 – Updated: 2026-03-26 19:52
VLAI
EPSS
VEX
Title
DOM-Based XSS in Ory Polis Login Page
Summary
Ory Polis, formerly known as BoxyHQ Jackson, bridges or proxies a SAML login flow to OAuth 2.0 or OpenID Connect. Versions prior to 26.2.0 contain a DOM-based Cross-Site Scripting (XSS) vulnerability in Ory Polis's login functionality. The application improperly trusts a URL parameter (`callbackUrl`), which is passed to `router.push`. An attacker can craft a malicious link that, when opened by an authenticated user (or an unauthenticated user that later logs in), performs a client-side redirect and executes arbitrary JavaScript in the context of their browser. This could lead to credential theft, internal network pivoting, and unauthorized actions performed on behalf of the victim. Version 26.2.0 contains a patch for the issue.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ory/polis/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/ory/polis/releases/tag/v26.2.0 | x_refsource_MISC |
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CVE-2026-27120 (GCVE-0-2026-27120)
Vulnerability from cvelistv5 – Published: 2026-02-20 21:27 – Updated: 2026-02-24 18:41
VLAI
EPSS
VEX
Title
Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster
Summary
Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/vapor/leaf-kit/security/adviso… | x_refsource_CONFIRM |
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CVE-2026-25688 (GCVE-0-2026-25688)
Vulnerability from cvelistv5 – Published: 2026-06-09 07:32 – Updated: 2026-06-09 14:56
VLAI
EPSS
VEX
Title
Apache Answer: XSS in AI Answer Rendering
Summary
Improper Neutralization of Alternate XSS Syntax vulnerability in Apache Answer.
This issue affects Apache Answer: through 2.0.0.
AI-generated response content was rendered in the browser without proper sanitization, allowing malicious scripts to be executed when the content was viewed.
Users are recommended to upgrade to version 2.0.1, which fixes the issue.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Answer |
Affected:
0 , ≤ 2.0.0
(semver)
|
Credits
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CVE-2026-22711 (GCVE-0-2026-22711)
Vulnerability from cvelistv5 – Published: 2026-04-07 18:39 – Updated: 2026-04-08 22:02
VLAI
EPSS
VEX
Title
Stored XSS through system messages in WikiLove
Summary
Improper neutralization of alternate XSS syntax vulnerability in The Wikimedia Foundation Mediawiki - Wikilove Extension allows Cross-Site Scripting (XSS).The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper neutralization of alternate XSS syntax
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Wikimedia Foundation | Mediawiki - Wikilove Extension |
Unaffected:
1.43
Unaffected: 1.44 Unaffected: 1.45 Affected: 0 , < 1.43 (custom) |
Credits
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CVE-2025-65961 (GCVE-0-2025-65961)
Vulnerability from cvelistv5 – Published: 2025-11-25 19:06 – Updated: 2025-11-25 19:29
VLAI
EPSS
VEX
Title
Contao is vulnerable to cross-site scripting in templates
Summary
Contao is an Open Source CMS. From version 4.0.0 to before 4.13.57, before 5.3.42, and before 5.6.5, it is possible to inject code into the template output that will be executed in the browser in the front end and back end. This issue has been patched in versions 4.13.57, 5.3.42, and 5.6.5. A workaround for this issue involves not using the affected templates or patch them manually.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contao/contao/security/advisor… | x_refsource_CONFIRM |
| https://contao.org/en/security-advisories/cross-s… | x_refsource_MISC |
Impacted products
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CVE-2025-62418 (GCVE-0-2025-62418)
Vulnerability from cvelistv5 – Published: 2025-10-16 18:35 – Updated: 2025-10-17 14:31
VLAI
EPSS
VEX
Title
bagisto - Cross Site Scripting (XSS) in TinyMCE Image Upload (SVG)
Summary
Bagisto is an open source laravel eCommerce platform. In Bagisto v2.3.7, the TinyMCE image upload functionality allows an attacker with sufficient privileges (e.g. admin) to upload a crafted SVG file containing embedded JavaScript. When viewed, the malicious code executes in the context of the admin/user’s browser. This vulnerability is fixed in 2.3.8.
Severity
6.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/bagisto/bagisto/security/advis… | x_refsource_CONFIRM |
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CVE-2025-62415 (GCVE-0-2025-62415)
Vulnerability from cvelistv5 – Published: 2025-10-16 18:36 – Updated: 2025-10-17 14:30
VLAI
EPSS
VEX
Title
bagisto - Cross Site Scripting (XSS) in TinyMCE Image Upload (HTML)
Summary
Bagisto is an open source laravel eCommerce platform. In Bagisto v2.3.7, the TinyMCE image upload functionality allows an attacker with sufficient privileges (e.g. admin) to upload a crafted HTML file containing embedded JavaScript. When viewed, the malicious code executes in the context of the admin/user’s browser. This vulnerability is fixed in 2.3.8.
Severity
6.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/bagisto/bagisto/security/advis… | x_refsource_CONFIRM |
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CVE-2025-62414 (GCVE-0-2025-62414)
Vulnerability from cvelistv5 – Published: 2025-10-16 18:33 – Updated: 2025-10-17 14:31
VLAI
EPSS
VEX
Title
bagisto - Cross Site Scripting (XSS) in Create New Customer
Summary
Bagisto is an open source laravel eCommerce platform. In Bagisto v2.3.7, the “Create New Customer” feature (in the admin panel) is vulnerable to Cross-Site Scripting (XSS). An attacker with access to the admin create-customer form can inject malicious JavaScript payloads into certain input fields. These payloads may later execute in the context of an admin’s browser or another user viewing the customer data, enabling session theft or admin-level actions. This vulnerability is fixed in 2.3.8.
Severity
6.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/bagisto/bagisto/security/advis… | x_refsource_CONFIRM |
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CVE-2025-55291 (GCVE-0-2025-55291)
Vulnerability from cvelistv5 – Published: 2025-08-18 17:06 – Updated: 2025-08-18 19:56
VLAI
EPSS
VEX
Title
Shaarli allows reflected XSS via searchtags parameter
Summary
Shaarli is a minimalist bookmark manager and link sharing service. Prior to 0.15.0, the input string in the cloud tag page is not properly sanitized. This allows the </title> tag to be prematurely closed, leading to a reflected Cross-Site Scripting (XSS) vulnerability. This vulnerability is fixed in 0.15.0.
Severity
7.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/shaarli/Shaarli/security/advis… | x_refsource_CONFIRM |
| https://github.com/shaarli/Shaarli/commit/66faa61… | x_refsource_MISC |
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Mitigation
Implementation
Resolve all input to absolute or canonical representations before processing.
Mitigation
Implementation
Carefully check each input parameter against a rigorous positive specification (allowlist) defining the specific characters and format allowed. All input should be neutralized, not just parameters that the user is supposed to specify, but all data in the request, including tag attributes, hidden fields, cookies, headers, the URL itself, and so forth. A common mistake that leads to continuing XSS vulnerabilities is to validate only fields that are expected to be redisplayed by the site. We often encounter data from the request that is reflected by the application server or the application that the development team did not anticipate. Also, a field that is not currently reflected may be used by a future developer. Therefore, validating ALL parts of the HTTP request is recommended.
Mitigation MIT-30.1
Implementation
Strategy: Output Encoding
- 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.
Mitigation MIT-43
Implementation
With Struts, write all data from form beans with the bean's filter attribute set to true.
Mitigation MIT-31
Implementation
Strategy: Attack Surface Reduction
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.
CAPEC-199: XSS Using Alternate Syntax
An adversary uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.