What’s Vulnerable › Vulnerabilities

CVE-2026-47345: TYPO3 HTML Sanitizer allows Cross-Site Scripting

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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

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.

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/8b5d0be44ded457ca993ec9ca93d859941c63764
• https://typo3.org/security/advisory/typo3-core-sa-2026-006

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