GHSA-p5j5-4j3q-8mq8

Suggest an improvement
Source
https://github.com/advisories/GHSA-p5j5-4j3q-8mq8
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-p5j5-4j3q-8mq8/GHSA-p5j5-4j3q-8mq8.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-p5j5-4j3q-8mq8
Aliases
Published
2026-06-12T20:07:46Z
Modified
2026-09-10T03:51:09Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
Summary
TYPO3 HTML Sanitizer allows Cross-site Scripting
Details

Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.

Credits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.

Database specific 
{
    "cwe_ids":  [
        "CWE-79"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-12T20:07:46Z",
    "nvd_published_at":  "2026-06-08T20:17:01Z",
    "severity":  "MODERATE"
}
References

Affected packages

Packagist / typo3/html-sanitizer

Package

Name
typo3/html-sanitizer
Purl
pkg:composer/typo3/html-sanitizer

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.3.2

Affected versions

v1.*
v1.0.0
v1.0.1
v1.0.2
v1.0.3
v1.0.4
v1.0.5
v1.0.6
v1.0.7
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v2.*
v2.0.0
v2.0.1
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9
v2.0.10
v2.0.11
v2.0.12
v2.0.13
v2.0.14
v2.0.15
v2.0.16
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v2.1.4
v2.2.0
v2.3.0
v2.3.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-p5j5-4j3q-8mq8/GHSA-p5j5-4j3q-8mq8.json"