CVE-2026-73661

Q: How do I fix CVE-2026-73661?

Upgrade freepbx to 16.0.47 or later.

Q: Is CVE-2026-73661 being actively exploited?

Not that we know of. CVE-2026-73661 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 22% of all scored CVEs.

Q: How severe is CVE-2026-73661?

CVE-2026-73661 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-73661 affect?

Published advisories record a fix for freepbx (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-15

How to fix

Remediation Available

freepbxNVD

Affected:>= 16.0, < 16.0.47Fixed in:16.0.47CVE-2026-73661derived from NVD

Affected:>= 17.0, < 17.0.30Fixed in:17.0.30CVE-2026-73661derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

0.31%probability of exploitation in 30 days

22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Patch2

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-15 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-39280	Critical	9.1	34%	-	-
CVE-2023-50252	High	8.3	24%	-	Fix
CVE-2024-38666	Critical	9.1	19%	-	-
CVE-2024-51544	High	8.2	13%	-	Fix
CVE-2024-10979	High	8.8	4.4%	-	Fix
CVE-2026-41176	Critical	9.8	3.2%	-	Fix

Common questions

How do I fix CVE-2026-73661?

Upgrade freepbx to 16.0.47 or later.

Is CVE-2026-73661 being actively exploited?

Not that we know of. CVE-2026-73661 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 22% of all scored CVEs.

How severe is CVE-2026-73661?

CVE-2026-73661 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-73661 affect?

Published advisories record a fix for freepbx (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-09.