What is GHSA-p5j5-4j3q-8mq8?

GHSA-p5j5-4j3q-8mq8 is a security advisory published by GitHub Security Advisories with Medium severity. TYPO3 HTML Sanitizer allows Cross-site Scripting

Which CVE IDs does GHSA-p5j5-4j3q-8mq8 cover?

GHSA-p5j5-4j3q-8mq8 covers the following CVE IDs: CVE-2026-47345. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-p5j5-4j3q-8mq8?

GHSA-p5j5-4j3q-8mq8 affects 1 product, including: composer/typo3/html-sanitizer:\u003c 2.3.2.

GHSA-p5j5-4j3q-8mq8Medium

TYPO3 HTML Sanitizer allows Cross-site Scripting

Vendor

GitHub Security Advisories

Published

June 12, 2026

Last Modified

June 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-47345 →

📋 Description

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.

🎯 Affected products1

composer/typo3/html-sanitizer:< 2.3.2

🔗 References (6)

https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8
https://nvd.nist.gov/vuln/detail/CVE-2026-47345
https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml
https://typo3.org/security/advisory/typo3-core-sa-2026-006
https://github.com/advisories/GHSA-p5j5-4j3q-8mq8