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CVE-2026-44237

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

Published: May 29, 2026Updated: Jun 1, 2026 Sources: CVE List NVDCWE-1390
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.2%
Top 90.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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 Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-1390

Affected Products

security-reportingFreePBX
On-prem
Communications / voip-telephony
freepbxsangoma
On-premWeb App
Communications / messaging-chat
freepbxoss-projectCommunicationsaka freepbx, security-reporting, endpoint
sangomacommercialCACommunicationsaka freepbx, certified asterisk, asterisk

Exploitability

Workaround Available

References

https://github.com/FreePBX/security-reporting/security/advisories/GHSA-vgjf-4h63-8vcc
github.com

Timeline

Published
May 29, 2026
Last Updated
Jun 1, 2026

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