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    2 vulnerabilities found for AngleSharp by AngleSharp

    CVE-2026-54570 (GCVE-0-2026-54570)

    Vulnerability from nvd – Published: 2026-08-18 17:39 – Updated: 2026-08-18 19:27
    VLAI
    Title
    AngleSharp: HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass
    Summary
    AngleSharp is a .NET library for parsing angle bracket based hyper-texts. Prior to 1.5.0, MathAnnotationXmlElement in AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs is not treated as an HTML integration point when its encoding attribute is text/html or application/xhtml+xml, causing Consume in AngleSharp/Html/Parser/HtmlDomBuilder.cs to route tokens through foreign-content parsing instead of HTML parsing. A sanitizer can therefore observe a different DOM from the browser that reparses the serialized output. An attacker can combine this namespace differential with markup-breaking characters in an attribute value so that an element hidden from the sanitizer becomes active script-capable HTML after browser reparse, resulting in mutation cross-site scripting. This issue is fixed in version 1.5.0.
    Severity
    6.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-18 19:27 UTC
    CWE
    • CWE-80 - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
    Assigner
    References
    Impacted products
    Vendor Product Version
    AngleSharp AngleSharp Affected: < 1.5.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-54570 (GCVE-0-2026-54570)

    Vulnerability from cvelistv5 – Published: 2026-08-18 17:39 – Updated: 2026-08-18 19:27
    VLAI
    Title
    AngleSharp: HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass
    Summary
    AngleSharp is a .NET library for parsing angle bracket based hyper-texts. Prior to 1.5.0, MathAnnotationXmlElement in AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs is not treated as an HTML integration point when its encoding attribute is text/html or application/xhtml+xml, causing Consume in AngleSharp/Html/Parser/HtmlDomBuilder.cs to route tokens through foreign-content parsing instead of HTML parsing. A sanitizer can therefore observe a different DOM from the browser that reparses the serialized output. An attacker can combine this namespace differential with markup-breaking characters in an attribute value so that an element hidden from the sanitizer becomes active script-capable HTML after browser reparse, resulting in mutation cross-site scripting. This issue is fixed in version 1.5.0.
    Severity
    6.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-18 19:27 UTC
    CWE
    • CWE-80 - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
    Assigner
    References
    Impacted products
    Vendor Product Version
    AngleSharp AngleSharp Affected: < 1.5.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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