CVE-2026-47344 TYPO3 HTML Sanitizer allows Cross-Site Scripting
Attackers can bypass XSS protections in TYPO3 HTML Sanitizer when insecure raw text is enabled, allowing script injection via malformed closing tags.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-47344?
CVE-2026-47344 is a low-severity cross-site scripting vulnerability in TYPO3 HTML Sanitizer, published on 8 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-47344?
2 open source packages ship an affected version, including typo3/html-sanitizer.
| Package | Affected | Fixed in |
|---|---|---|
typo3/html-sanitizer Packagist | All versions | 2.3.2 |
typo3/html-sanitizer Packagist | All versions | 2.3.2 |
How do I fix CVE-2026-47344?
Upgrade typo3/html-sanitizer to 2.3.2 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-47344 being exploited?
There is no known exploitation of CVE-2026-47344 in the wild and no public exploit code.
Sources
Also known as GHSA-jvf5-rxvv-3mcg.