CVE-2026-77140: TYPO3 Extension Telephone Directory

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

The extension validates the HMAC of a frontend employee edit link only in the action that renders the edit form, not in the action that persists the change. An unauthenticated visitor who knows the UID of a visible employee record can send a direct POST request to the update action and overwrite that record without a valid edit link or any ownership check.

Affected products

• TYPO3 Extension Telephone Directory: from 6.0.0, before 6.2.0 (fixed in 6.2.0); from 5.0.0, before 5.0.1 (fixed in 5.0.1); before 4.1.1 (fixed in 4.1.1)

Published 2026-08-25. Last modified 2026-09-28.