CVE-2026-77127: TYPO3 Extension Modules

Medium severity, CVSS 6.0. EPSS: 0.4% chance of exploitation in the next 30 days.

The extension fails to restrict a backend AJAX endpoint for inline editing to fields the current user is permitted to see or edit. An authenticated, low-privileged backend user can supply arbitrary table, field and record parameters, and trigger an error response that discloses the current database value of the requested field, leading to disclosure of sensitive information such as backend and frontend user password hashes. Exploitation requires a valid, authenticated TYPO3 backend user account with access to the extensions backend module.

Affected products

• TYPO3 Extension Modules: from 8.0.0, before 8.1.4 (fixed in 8.1.4); before 7.10.4 (fixed in 7.10.4)

Published 2026-08-25. Last modified 2026-08-26.