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CVE-2026-40520

FreePBX api module Command Injection via GraphQL

Published: Apr 21, 2026Updated: Apr 23, 2026 Sources: CVE List NVDCWE-78
NVD MITRE
7.2CVSSHIGH
EPSS Score
1.4%
Top 31.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

FreePBX api module version 17.0.8 and prior contain a command injection vulnerability in the initiateGqlAPIProcess() function where GraphQL mutation input fields are passed directly to shell_exec() without sanitization or escaping. An authenticated user with a valid bearer token can send a GraphQL moduleOperations mutation with backtick-wrapped commands in the module field to execute arbitrary commands on the underlying host as the web server user.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-78

Affected Products

apiFreePBX
On-prem
Communications / voip-telephony
apifreepbx
On-prem
Communications / voip-telephony
freepbxoss-projectCommunicationsaka freepbx, security-reporting, endpoint

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/FreePBX/api/commit/5f194e39a47e5481e8947f9694304d32724175f6
github.com
https://github.com/FreePBX/api/blob/5f194e39a47e5481e8947f9694304d32724175f6/Api.class.php#L546C1-L554C3
github.com
https://github.com/FreePBX/api/blob/5f194e39a47e5481e8947f9694304d32724175f6/ApiGqlHelper.class.php#L34C1-L36C136
github.com
and 1 more references View all →

Timeline

Published
Apr 21, 2026
Last Updated
Apr 23, 2026

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