CVE-2026-73661 FreePBX: Authenticated Framework AUTHTYPE Can Be Restored From a Crafted Backup
An authenticated attacker can restore a crafted backup to disable FreePBX authentication, bypassing security controls and potentially gaining unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73661?
CVE-2026-73661 is a high-severity authentication bypass vulnerability in Sangoma Freepbx, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
FreePBX is an open source IP PBX. Prior to 16.0.47 and 17.0.30, the FreePBX Framework module permits a crafted backup to restore the hidden AUTHTYPE setting with the value none through runRestore() in amp_conf/htdocs/admin/libraries/Builtin/Restore.php. An authenticated user with sufficient backup-restore access or write access to backup files can thereby disable FreePBX authentication during restoration, bypassing the user-interface removal of AUTHTYPE=none. This issue is fixed in versions 16.0.47 and 17.0.30.
Weakness: CWE-15
Which versions are affected by CVE-2026-73661?
It affects 1 product.
Products include Sangoma Freepbx.
How do I fix CVE-2026-73661?
No fix has been published for CVE-2026-73661 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-73661 being exploited?
There is no known exploitation of CVE-2026-73661 in the wild and no public exploit code.
Other vulnerabilities in Sangoma Freepbx
- CVE-2025-57819 Sangoma FreePBX Authentication Bypass
- CVE-2019-19006 Sangoma FreePBX Improper Authentication
- CVE-2026-73663 FreePBX: Unauthenticated SQL injection in FreePBX missedcall via inbound Caller ID name leads to administrator takeover
- CVE-2026-73665 FreePBX UCP: Unauthenticated remote code execution via socket.io namespace auth bypass and AMI action injection
- CVE-2026-46376 FreePBX: Unauthenticated Use of Hard-Coded Credentials Vulnerability in FreePBX UCP Interface
Sources
Also known as GHSA-f6hc-rqxg-ch86.