CVE-2026-44237CWE-1390

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

High · published May 29, 2026

CVSS v4.0
7.6
EPSS
0%
Percentile
27.4
In the wild
Unconfirmed
What it is

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 client_id is required. The validateClient() method in ClientRepository.php unconditionally returns true, allowing any party with knowledge of a valid client_id to obtain OAuth2 access tokens without providing the correct client_secret. This vulnerability is fixed in 17.0.8.

The record
Technical detail
CVSS v4.0
7.6 · HIGH
Vector
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
EPSS
0.00350 · 27.4th percentile
Weakness
CWE-1390 · Weak Authentication
Published
2026-05-29T12:46Z
EPSS history
Timeline
  • 29 MAY 12:46Z
    FreePBX: Authenticated Access can lead to Subsequent OAuth2 Authentication Bypass in API Module
    cvelistv5