High severity · published May 29, 2026
CVE-2026-44237
FreePBX: Authenticated Access can lead to Subsequent OAuth2 Authentication Bypass in API Module
8.1
CVSS
2.7%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.7% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-reporting · FreePBX
< 17.0.8 · source: vendor
FR
Freepbx · Sangoma
before 17.0.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44237
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44237
Mitigation
https://github.com/FreePBX/security-reporting/security/advisories/GHSA-vgjf-4h63-8vcc
More from security-reporting
9.8
CVE-2026-46376
FreePBX: Unauthenticated Use of Hard-Coded Credentials Vulnerability in FreePBX UCP Interface
8.8
CVE-2026-75600
FreePBX: Authenticated API generatedocs Host Command Injection
8.8
CVE-2026-54710
FreePBX: Authenticated Superfecta Arbitrary PHP Code Execution (RCE via Unsafe File Inclusion)
8.8
CVE-2026-54708
Authenticated Remote Code Execution via Path Traversal in FreePBX Backup Module
8.8
CVE-2026-54675
FreePBX: Authenticated Remote Code Execution via File Upload and Convert in Soundlang Module