CVE-2026-54570

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-54570
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54570.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54570
Aliases
Published
2026-08-18T17:39:51Z
Modified
2026-09-20T11:30:55Z
Severity
  • 6.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N CVSS Calculator
Summary
AngleSharp: HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-80"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54570.json"
}
References

Affected packages

Git / github.com/anglesharp/anglesharp

Affected ranges

Type
GIT
Repo
https://github.com/anglesharp/anglesharp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8033a5c690af9c2c443f58e34875343fa4cc1d07
Fixed
868a3d2f10e191c72e7adc32972e185cce652356
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.5.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

1.*
1.0.0-alpha-229
1.0.3
1.0.4-alpha-289
1.0.7
1.1.0
1.1.2
1.2.0
1.3.1
1.4.0-beta.493
1.4.0-beta.496
1.4.1-beta.508
1.4.1-beta.525
v0.*
v0.10.0
v0.10.1
v0.11.0
v0.12.0
v0.16.0
v0.17.0
v0.17.1
v0.2
v0.3
v0.4
v0.5
v0.6
v0.7
v0.8
v0.9
v0.9.7
v0.9.8
v0.9.8.1
v0.9.9
v1.*
v1.0.1
v1.0.2
v1.0.4
v1.0.5
v1.0.6
v1.4.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54570.json"