{"apiVersion":"1.0","identifier":"CVE-2026-54570","description":"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.","publishedAt":"2026-08-18T18:18:23","lastModifiedAt":"2026-08-18T20:17:18","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54570","cvssScore":6.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","epssProbability":0.00246,"riskScore":0.71,"affectedProduct":"AngleSharp","affectedVersions":"<1.5.0","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-54570","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-54570","en":"https://www.redsauce.net/en/cves/CVE-2026-54570","fr":"https://www.redsauce.net/fr/cves/CVE-2026-54570","pt":"https://www.redsauce.net/pt/cves/CVE-2026-54570","de":"https://www.redsauce.net/de/cves/CVE-2026-54570","sk":"https://www.redsauce.net/sk/cves/CVE-2026-54570","el":"https://www.redsauce.net/el/cves/CVE-2026-54570"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-54570"}}