FreePBX up to 17.0.7 API Module ClientRepository.php validateClient weak authentication

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in FreePBX up to 17.0.7. Affected by this issue is the function validateClient of the file ClientRepository.php of the component API Module. Such manipulation leads to weak authentication. This vulnerability is traded as CVE-2026-44237. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in FreePBX up to 17.0.7 and classified as critical. Affected by this issue is the function validateClient of the file ClientRepository.php of the component API Module. The manipulation with an unknown input leads to a weak authentication vulnerability. Using CWE to declare the problem leads to CWE-1390. The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 advisory is available at github.com. This vulnerability is handled as CVE-2026-44237 since 05/05/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

By approaching the search of inurl:ClientRepository.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 17.0.8 eliminates this vulnerability.

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Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Weak authentication
CWE: CWE-1390
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Google Hack: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreePBX 17.0.8

Timelineinfo

05/05/2026 CVE reserved
05/29/2026 +24 days Advisory disclosed
05/29/2026 +0 days VulDB entry created
05/29/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-vgjf-4h63-8vcc
Status: Confirmed

CVE: CVE-2026-44237 (🔒)
GCVE (CVE): GCVE-0-2026-44237
GCVE (VulDB): GCVE-100-367214

Entryinfo

Created: 05/29/2026 17:15
Changes: 05/29/2026 17:15 (68)
Complete: 🔍
Cache ID: 216::103

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