CVE-2026-40520
Authenticated GraphQL mutation allows remote code execution via shell_exec in FreePBX API.
Is CVE-2026-40520 being exploited?
Not confirmed. CVE-2026-40520 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 1.4% probability of exploitation in the next 30 days.
How severe is CVE-2026-40520?
CVE-2026-40520 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-40520?
Yes. A fix has been recorded for CVE-2026-40520. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40520 affect?
CVE-2026-40520 affects FreePBX API module (<= 17.0.8). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40520?
Upgrade to patched version when released; monitor for abuse; rotate tokens.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE on server as web server user via crafted GraphQL input; authenticated attacker with bearer token.
Immediate action required
- affected<= 17.0.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.