CVE-2026-77140 Broken Access Control in extension "Telephone Directory" (telephonedirectory)
Unauthenticated attackers can modify employee records in the Telephone Directory extension by bypassing HMAC validation on the update action.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77140?
CVE-2026-77140 is a high-severity missing authorization vulnerability in TYPO3 Extension "Telephone Directory", published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-77140?
How do I fix CVE-2026-77140?
No fix has been published for CVE-2026-77140 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-77140 being exploited?
There is no known exploitation of CVE-2026-77140 in the wild and no public exploit code.
Sources
Also known as GHSA-q34j-6h38-m895.