Vulnerability · Published Jun 8, 2026 · Assigned by TYPO3
CVE-2026-47345TYPO3 HTML Sanitizer allows Cross-Site Scripting
Medium 5.1
In plain English
A medium-severity cross-site scripting in HTML Sanitizer from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.5%top 58.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | typo3/html-sanitizer | 2.3.2 | GHSA-p5j5-4j3q-8mq8 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TYPO3 | HTML Sanitizer | 0 – before 2.3.2 |
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N