CVE-2026-47346: TYPO3 CMS

High severity, CVSS 7.6. EPSS: 0.4% chance of exploitation in the next 30 days.

Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.

Affected products

• TYPO3 TYPO3 CMS: before 10.4.57 (fixed in 10.4.57); from 11.0.0, before 11.5.51 (fixed in 11.5.51); from 12.0.0, before 12.4.46 (fixed in 12.4.46); from 13.0.0, before 13.4.31 (fixed in 13.4.31); from 14.0.0, before 14.3.3 (fixed in 14.3.3)

Published 2026-06-09. Last modified 2026-07-23.