OAuth2 Implementation Flaw in FreePBX Affects Credential Validation
CVE-2026-44237

7.6HIGH

Key Information:

Vendor

Freepbx

Status
Security-reporting
Vendor
CVE Published:
29 May 2026

What is CVE-2026-44237?

The FreePBX API module has a significant vulnerability due to insufficient validation of client credentials during OAuth2 token issuance. Under versions before 17.0.8, the validateClient() method in ClientRepository.php fails to adequately check the client_secret. This oversight allows attackers who possess a valid client_id to obtain OAuth2 access tokens without the necessary client_secret, potentially enabling unauthorized access to system functions and sensitive data. This vulnerability is mitigated in version 17.0.8.

Affected Version(s)

security-reporting < 17.0.8

References

https://github.com/FreePBX/security-reporting/security/ad...
x_refsource_CONFIRM

CVSS V4

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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