FreePBX api up to 17.0.8 GraphQL initiateGqlAPIProcess os command injection

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in FreePBX api up to 17.0.8. This affects the function initiateGqlAPIProcess of the component GraphQL. Performing a manipulation results in os command injection. This vulnerability is reported as CVE-2026-40520. The attack is possible to be carried out remotely. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in FreePBX api up to 17.0.8. This affects the function initiateGqlAPIProcess of the component GraphQL. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-40520 since 04/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Applying the patch 5f194e39a47e5481e8947f9694304d32724175f6 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

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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: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔒

CNA Base Score: 7.2
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Os command injection
CWE: CWE-78 / CWE-77 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 5f194e39a47e5481e8947f9694304d32724175f6

Timelineinfo

04/13/2026 CVE reserved
04/21/2026 +8 days Advisory disclosed
04/21/2026 +0 days VulDB entry created
07/17/2026 +86 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 5f194e39a47e5481e8947f9694304d32724175f6
Status: Confirmed

CVE: CVE-2026-40520 (🔒)
GCVE (CVE): GCVE-0-2026-40520
GCVE (VulDB): GCVE-100-358437

Entryinfo

Created: 04/21/2026 15:54
Updated: 07/17/2026 01:40
Changes: 04/21/2026 15:54 (80), 07/17/2026 01:40 (11)
Complete: 🔍
Cache ID: 216::103

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