Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck

CVE-2026-111664Safing Portmaster before 2.2.5 Unauthenticated Forced Downgrade via /api/v1/updates/from-url

Medium 4.4

In plain English

A medium-severity missing authentication in portmaster from safing. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)4.4Medium

Exploit odds (30 days)0.1%top 98.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Safing Portmaster before 2.2.5 contains a missing authorization vulnerability that allows unprivileged local processes to force updates by calling the POST /api/v1/updates/from-url endpoint registered with api.PermitAnyone. Attackers can supply an attacker-controlled index URL that bypasses version checks and auto-apply settings, installing older Safing-signed releases carrying previously fixed vulnerabilities.

Affected products (as reported)

Vendor	Product	Versions
safing	portmaster	0 – before 2.2.5

Weakness: CWE-306 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

https://github.com/safing/portmaster/issues/2292 issue-tracking
https://github.com/safing/portmaster/blob/v2.2.3/service/core/api.go#L145-L159 technical-description
https://github.com/safing/portmaster/commit/f943e1eaf98f45bc48490bf288e1d63c04929ae0 patch
portmaster v2.2.5 Release Notes release-notes
VulnCheck Advisory: Safing Portmaster before 2.2.5 Unauthenticated Forced Downgrade via /api/v1/updates/from-url third-party-advisory