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CVE-2026-47345

TYPO3 HTML Sanitizer allows Cross-Site Scripting

MEDIUM
5.1
CVSS Score
Published: June 8, 2026 at 07:04 PM UTC
Updated: July 23, 2026 at 07:32 PM UTC
1 product affected across 1 vendorHtml Sanitizer

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Severity
MEDIUM5.1
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Html Sanitizer· TYPO3composer
95%
v < 2.3.2
Affected range stops below 2.3.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://typo3.org/security/advisory/typo3-core-sa-2026-006
Patch
Source: cverecord
https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.1MEDIUMTYPO3
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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