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TI-2026-34919 Aliases CVE-2026-47344GHSA-jvf5-rxvv-3mcg

TYPO3 HTML Sanitizer allows Cross-Site Scripting

Priority LOW 11CWE-436Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

When ALLOW_INSECURE_RAW_TEXT is enabled, whitespace-variant closing tags (e.g., </style\t>) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version 2.3.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00282 20th percentileScored 2026-11-07
Fix Fixed HTML Sanitizer (TYPO3): 2.3.2typo3/html-sanitizer (Packagist): 2.3.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TYPO3HTML Sanitizerbefore 2.3.22.3.2Patch availableCNA
—typo3/html-sanitizer (Packagist)before 2.3.22.3.2Patch availableGHSA-jvf5-rxvv-3mcg
  • HTML Sanitizer VendorTYPO3 Affected before 2.3.2 Fixed in 2.3.2 Patch available CNA
  • typo3/html-sanitizer (Packagist) Vendor— Affected before 2.3.2 Fixed in 2.3.2 Patch available GHSA-jvf5-rxvv-3mcg

Remediation

  • Fix · CNA HTML Sanitizer (TYPO3) Fixed in 2.3.2
  • Fix · GHSA-jvf5-rxvv-3mcg typo3/html-sanitizer (Packagist) Fixed in 2.3.2 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    TYPO3 HTML Sanitizer — typo3.org/security/advisory/typo3-core-sa-2026-006

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-34920 TYPO3 HTML Sanitizer allows Cross-Site ScriptingPriority LOW 24
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47344
  2. 2026-10-03 Alias added: GHSA-jvf5-rxvv-3mcg

References

Patch 1

Advisory 2

Other 3

  • TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
  • TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
  • TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
  • TI-2025-30547 The sr_feuser_register extension through 12.4.8 for TYPO3 allows Remote Code Execution. CVSS 3.1CRITICAL 10.0
  • TI-2019-08867 The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before… CVSS 3.1CRITICAL 9.8
  • TI-2008-04019 Unspecified vulnerability in the TYPO3 Secure Directory (kw_secdir) extension before… CVSS 2.0HIGH 10.0
See all 411 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences