What’s Vulnerable › Vulnerabilities

CVE-2026-47344: TYPO3 HTML Sanitizer allows Cross-Site Scripting

• Severity: low (CVSS 2.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-79

Description

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.

Affected products

• TYPO3 html-sanitizer: before 2.3.2 — fixed in 2.3.2

How to fix

Upgrade to a fixed version: TYPO3 html-sanitizer 2.3.2. Check the vendor advisory for mitigations.

References

• https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c
• https://typo3.org/security/advisory/typo3-core-sa-2026-006

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