CVE-2026-73661: FreePBX is an open source IP PBX

Routine

MEDIUM 6.5UPGRADE

CVE-2026-73661 is a medium-severity flaw (CVSS 6.5) affecting freepbx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 A

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-15
Published	2026-08-13
Last modified	2026-10-09

Publisher (CNA): GitHub, Inc. · Vendor: sangoma

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-13 22:17 UTCPublished CVE record published
2026-10-09 19:44 UTCUpdated Record last modified

sangoma freepbx UPGRADE

Affected: >= 16.0 and < 16.0.47 · >= 17.0 and < 17.0.30

Fixed in: 16.0.47, 17.0.30

Safe to downgrade to: a release before 16.0

1. Check installed version

apt-cache policy freepbx || rpm -q freepbx || freepbx --version

2. UPGRADE to 16.0.47 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freepbx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freepbx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 16.0 (Debian / Ubuntu)

apt-cache madison freepbx sudo apt install freepbx=<VERSION_BEFORE_16.0> sudo apt-mark hold freepbx

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list freepbx sudo dnf downgrade freepbx-<VERSION_BEFORE_16.0> sudo dnf versionlock add freepbx

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-73661?

freepbx: upgrade to 16.0.47, 17.0.30. Exact commands for each OS are on this page.

Is CVE-2026-73661 being exploited?

CVE-2026-73661 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-73661 affect?

CVE-2026-73661 affects freepbx. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-73661?

Priority 29/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-45562 HIGH 7.2 UPGRADE FreePBX is an open source IP PBX
CVE-2026-54674 HIGH 8.8 UPGRADE FreePBX is an open source IP PBX
CVE-2026-54675 HIGH 8.8 UPGRADE FreePBX is an open source IP PBX
CVE-2026-54708 HIGH 8.8 UPGRADE FreePBX is an open source IP PBX
CVE-2026-54710 HIGH 8.8 UPGRADE FreePBX is an open source IP PBX

References

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