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FreePBX EUVDEUVD-2026-58540

| CVE-2026-73664 HIGH
Improper Privilege Management (CWE-269)
2026-08-13 security-advisories@github.com
PHP Privilege Escalation
8.6
CVSS 4.0 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.1 CRITICAL

Network-accessible AJAX endpoint requires admin auth (PR:H); scope changes from web app context to OS shell via unrestricted SSH key injection.

3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (github).

CVSS VectorVendor: github

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 23:04 EUVD
Analysis Generated
Aug 13, 2026 - 22:43 vuln.today
CVE Published
Aug 13, 2026 - 22:17 cve.org
HIGH 8.6

DescriptionCVE.org

FreePBX is an open source IP PBX. From 17.0.5.34 until 17.0.11, the publicKeySave AJAX endpoint in Backup.class.php accepts an authenticated administrator's SSH public key and appends it to /home/asterisk/.ssh/authorized_keys for the asterisk system user without reliably enforcing backup-only command and source restrictions. The key grants persistent shell access that can execute arbitrary commands, access FreePBX and call data, modify system files, and disrupt services. This issue is fixed in version 17.0.11.

AnalysisAI

SSH key injection in FreePBX versions 17.0.5.34 through 17.0.10.x allows authenticated administrators to escalate from web application control to persistent OS-level shell access on the underlying host. The publicKeySave AJAX endpoint in Backup.class.php appends caller-supplied SSH public keys to /home/asterisk/.ssh/authorized_keys without reliably enforcing backup-only command restrictions or source IP constraints, granting the asterisk OS user unrestricted interactive shell access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain FreePBX admin credentials
Delivery
Authenticate to web admin panel
Exploit
POST attacker SSH public key to publicKeySave endpoint
Execution
Unrestricted key appended to /home/asterisk/.ssh/authorized_keys
Persist
SSH into host as asterisk OS user
Impact
Execute arbitrary commands and persist on system
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Vulnerability AssessmentAI

Exploitation Exploitation requires an active authenticated session with FreePBX administrator privileges (CVSS PR:H confirmed). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.6 (PR:H) accurately reflects that this vulnerability requires existing authenticated administrator access to the FreePBX web interface, which is the primary limiting factor on its real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained FreePBX administrator credentials - through phishing, credential stuffing, or insider access - sends a crafted POST request to the publicKeySave AJAX endpoint with their own SSH public key as the payload. The endpoint appends the key to /home/asterisk/.ssh/authorized_keys without a forced-command restriction, after which the attacker opens an SSH session directly to the host as the asterisk user, establishing persistent OS-level access independent of the FreePBX web session. …
Remediation The primary fix is to upgrade FreePBX to version 17.0.11, which resolves the improper key handling in Backup.class.php per the vendor's own security advisory at https://github.com/FreePBX/security-reporting/security/advisories/GHSA-24w6-hpg3-rwfg. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all FreePBX installations running versions 17.0.5.34-17.0.10.x, immediately restrict administrative web access to essential personnel, and audit /home/asterisk/.ssh/authorized_keys for unauthorized keys and recent SSH logs for suspicious activity. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-58540 vulnerability details – vuln.today
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