How severe is CVE-2026-40520?

CVE-2026-40520 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40520?

CVE-2026-40520 affects Freepbx Api. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40520?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40520 have an EU (EUVD) identifier?

Yes. CVE-2026-40520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24086.

When was CVE-2026-40520 published?

CVE-2026-40520 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40520

CVE-2026-40520 is a high-severity vulnerability in Freepbx Api with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 8.6
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24086
Weakness: CWE-78
Affected product: Freepbx Api
Published: 2026-04-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-40520?: 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.
How severe is CVE-2026-40520?: CVE-2026-40520 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40520?: CVE-2026-40520 affects Freepbx Api. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40520?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40520 have an EU (EUVD) identifier?: Yes. CVE-2026-40520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24086.
When was CVE-2026-40520 published?: CVE-2026-40520 was published on 2026-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:freepbx:api:*:*:*:*:*:*:*:*

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