Authorization bypass through user-controlled key in Telephone Directory - CVE-2026-77140
Published: August 27, 2026
Vulnerability identifier: #VU145907
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77140
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the affected 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. A remote attacker can overwrite the record without a valid edit link or any ownership check.
Affected software
Telephone Directory
How to mitigate CVE-2026-77140
Install updates from vendor's website.
Telephone Directory - update to 6.2.0