Medium severity · published Aug 13, 2026
CVE-2026-73661
FreePBX: Authenticated Framework AUTHTYPE Can Be Restored From a Crafted Backup
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
framework · FreePBX
< 16.0.47; >= 17.0.1, < 17.0.30 · source: vendor
FR
Freepbx · Sangoma
16.0 before 16.0.47; 17.0 before 17.0.30 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73661
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73661
Patch
https://github.com/FreePBX/framework/commit/0591581654bc269df05cbb7093645d6934d4d861
Patch
https://github.com/FreePBX/framework/commit/ea684be89abb393d1aff7f979d5fd751ff338dfd
Mitigation
https://github.com/FreePBX/security-reporting/security/advisories/GHSA-f6hc-rqxg-ch86