EUVD-2026-55228
GHSA-hf49-w8xr-2c35
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-reachable panel, no attacker credentials required, but admin user interaction is mandatory; full admin control over telephony justifies C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (TuranSec).
CVSS VectorVendor: TuranSec
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
A cross-site request forgery (CSRF) vulnerability in FreePBX Framework 17.0 allows an unauthenticated remote attacker to perform administrative actions on behalf of an authenticated administrator. The /admin/ajax.php dispatcher in amp_conf/htdocs/admin/libraries/BMO/Ajax.class.php does not implement CSRF tokens; its only protection is a Referer header check that is bypassed when the request is sent without a Referer header or from a same-site context, enabling attackers to trigger admin operations by luring an administrator to a malicious page.
Articles & Coverage 1
AnalysisAI
Cross-site request forgery in FreePBX Framework 17.0 permits an unauthenticated remote attacker to execute arbitrary administrative operations against the telephony platform by forging requests on behalf of a logged-in administrator. The root cause is the complete absence of CSRF token validation in the BMO Ajax dispatcher (Ajax.class.php), whose sole defence - a Referer header check - is trivially bypassed by suppressing the header or exploiting same-site request semantics. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target administrator must hold an active authenticated FreePBX session (valid session cookie) at the moment the forged request is submitted - exploitation is limited to the window during which an admin is logged in. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately characterises the attack profile: network-reachable, low complexity, no attacker credentials required, one user interaction needed (admin visits a malicious page), and full C/I/A impact within the application scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a FreePBX 17.0 deployment and crafts a malicious web page containing hidden HTML forms or JavaScript `fetch()` calls with `referrerPolicy: 'no-referrer'` targeting the victim organisation's `/admin/ajax.php` endpoint. The attacker sends a phishing email to a FreePBX administrator who is currently logged into the panel; upon visiting the malicious page, the admin's browser silently submits the forged request - carrying the legitimate session cookie - causing FreePBX to execute the attacker-chosen administrative action, such as adding a rogue SIP trunk, creating a backdoor admin account, or modifying call routing rules. … |
| Remediation | No vendor-released patch has been identified at time of analysis; the available references point only to the upstream GitHub repository (https://github.com/FreePBX/framework) and the vulnerable source file, with no tagged release, changelog entry, or vendor security advisory confirming a fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all FreePBX 17.0 instances across your infrastructure and restrict administrative access to whitelisted IP addresses via firewall. …
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External POC / Exploit Code
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