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FreePBX FreePBX API moduleFreePBX: Authenticated Access can lead to Subsequent OAuth2 Authentication Bypass in API Module

Risk 60
Severity
7.6
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

FreePBX is an open source IP PBX. Prior to 17.0.8, the FreePBX api module's OAuth2 implementation does not sufficiently validate client credentials during token issuance. Knowledge of a valid clientid is required. The validateClient() method in ClientRepository.php unconditionally returns true, allowing any party with knowledge of a valid clientid to obtain OAuth2 access tokens without providing the correct clientsecret. This vulnerability is fixed in 17.0.8.

First published (updated )
CVE-2026-44237

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