CVE-2026-73664 FreePBX: Authenticated Arbitrary SSH Key Injection via Backup Module
An authenticated administrator can inject SSH keys to gain persistent shell access and execute arbitrary commands on the FreePBX server.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73664?
CVE-2026-73664 is a high-severity vulnerability in FreePBX backup, published on 13 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-73664?
How do I fix CVE-2026-73664?
No fix has been published for CVE-2026-73664 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-73664 being exploited?
There is no known exploitation of CVE-2026-73664 in the wild and no public exploit code.