CVE-2026-54570

Published: Ago 18, 2026 Last Modified: Ago 18, 2026

ExploitDB:

Other exploit source:

Google Dorks:

MEDIUM 6,9

Source: [email protected]

Attack Vector: network

Attack Complexity: high

Privileges Required: none

User Interaction: required

Scope: changed

Confidentiality: low

Integrity: high

Availability: none

Description

AI Translation Available

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.