CVE-2026-54570 AngleSharp: HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass

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...

CVE-2026-54570

AngleSharp versions prior to 1.5.0 fail to assign NodeFlags.HtmlTip to MathAnnotationXmlElement, causing token dispatch to route through foreign-content parsing instead of HTML parsing. Combined with unescaped characters in attribute values, this allows an attacker to hide malicious elements fro...

AngleSharp HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass

Summary The HTML specification requires that a MathML element with encoding="text/html" or encoding="application/xhtml+xml" is treated as an HTML integration point. Content inside it must be parsed as HTML, not MathML. AngleSharp does not implement this correctly. As a result, the parser produces...

GHSA-PGWW-W46G-26QG AngleSharp HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass

Summary The HTML specification requires that a MathML element with encoding="text/html" or encoding="application/xhtml+xml" is treated as an HTML integration point. Content inside it must be parsed as HTML, not MathML. AngleSharp does not implement this correctly. As a result, the parser produces...

PT-2026-60902

Name of the Vulnerable Software and Affected Versions AngleSharp versions prior to 1.5.0 Description AngleSharp fails to correctly implement the HTML specification regarding the element. When this element has an encoding attribute set to text/html or application/xhtml+xml, it should be treated as...

AngleSharp HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass

The HTML specification requires that a MathML element with encoding="text/html" or encoding="application/xhtml+xml" is treated as an HTML integration point. Content inside it must be parsed as HTML, not MathML. AngleSharp does not implement this correctly. As a result, the parser produces a DOM...