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FreePBX Framework CVE-2026-73661

| EUVDEUVD-2026-58484 HIGH
External Control of System or Configuration Setting (CWE-15)
2026-08-13 GitHub_M
PHP Authentication Bypass Framework
8.6
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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
9.6 CRITICAL

Low-privilege network access can disable system-wide authentication (scope change to all users and Asterisk backend), yielding full confidentiality and integrity impact with no availability effect.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 13, 2026 - 22:19 EUVD
Source Code Evidence Fetched
Aug 13, 2026 - 22:06 vuln.today
Analysis Generated
Aug 13, 2026 - 22:06 vuln.today
CVE Published
Aug 13, 2026 - 21:25 cve.org
HIGH 8.6

DescriptionCVE.org

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.

AnalysisAI

FreePBX Framework's restore functionality allows an authenticated user with backup-restore privileges to inject the hidden AUTHTYPE=none configuration setting via a crafted backup archive, completely disabling web administration authentication on the affected PBX. Versions prior to 16.0.47 (branch 16) and 17.0.30 (branch 17) are confirmed affected; vendor patches have been released. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain FreePBX account with backup-restore privileges
Delivery
Craft backup archive containing AUTHTYPE=none config entry
Exploit
Upload or place crafted backup via restore interface
Install
Trigger runRestore() to process backup
C2
AUTHTYPE=none written to system configuration
Execute
FreePBX authentication disabled globally
Impact
Access admin panel without credentials from any network location
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Vulnerability AssessmentAI

Exploitation Exploitation requires an existing authenticated FreePBX account with Backup & Restore module access, or filesystem-level write access to the backup archive storage directory - this is a non-default elevated privilege, not available to standard users. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.6 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N) accurately reflects the two-stage risk structure: exploitation is straightforward (low complexity, no special attack requirements) for anyone holding a FreePBX account with backup-restore access, but that account requirement (PR:L) is the meaningful friction point. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated FreePBX user with backup-restore module access crafts a backup archive that includes a configuration entry setting AUTHTYPE=none, then triggers a restore via the administrative web interface. The runRestore() function on unpatched versions processes the setting without filtering and writes it to the system configuration. …
Remediation The primary fix is upgrading the FreePBX Framework module to version 16.0.47 or 17.0.30, which introduces an explicit AUTHTYPE=none guard in runRestore() that logs and skips the setting rather than applying it. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all FreePBX instances and document their current versions using your inventory management system. …

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

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CVE-2026-73661 vulnerability details – vuln.today
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