🛡️ CVE-2026-47345 — html-sanitizer

⚪ Unknown ✅ No Known Exploit CWE-79 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

TYPO3 HTML Sanitizer allows Cross-site Scripting

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality none, integrity none, availability none.

Weakness class

CVE-2026-47345 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-47345 is recorded against 2 packages.

  • typo3/html-sanitizer (fixed in 2.3.2)
  • unknown

Timeline and source

Published on 12 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
typo3.org (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector 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
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-06-12
Updated 2026-08-12
Modified 2026-06-12
Fix URL N/A

Affected Packages

Software From version Fixed in
typo3/html-sanitizer — 2.3.2
unknown — —

Similar Threats

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