CVE-2026-73661Network attack vectorHinoki check available

Authenticated login bypass via crafted backup restore

Published Aug 13, 2026 · Updated Aug 13, 2026

Authentication bypass in FreePBX Framework before 16.0.47 and 17.0.1 through 17.0.29 allows remote authenticated users to disable login checks. During runRestore(), Restore.php accepts AUTHTYPE from backup data and writes the value none instead of rejecting that security-sensitive setting. Backup-restore permission or write access to backup files is required; a successful restoration removes the FreePBX login gate.

CVSS severity8.6
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in FreePBX Framework before 16.0.47 and 17.0.1 through 17.0.29 allows remote authenticated users to disable login checks. During runRestore(), Restore.php accepts AUTHTYPE from backup data and writes the value none instead of rejecting that security-sensitive setting. Backup-restore permission or write access to backup files is required; a successful restoration removes the FreePBX login gate.

The record

CVE
CVE-2026-73661
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
FreePBX
Product
Framework
Classifications
CWE-15, T1556
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 16.0.47
  2. Affected versionversion=>= 17.0.1, < 17.0.30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FreePBX · Frameworkversion=< 16.0.47; version=>= 17.0.1, < 17.0.30

Published CVSS scores

8.6FreePBXCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-15External Control of System or Configuration Setting
T1556Modify Authentication Process

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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