Auth bypass in Safing Portmaster
CVE-2026-111664
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/safing/portmaster/issues/2292 (issue-tracking)
- github.com/safing/portmaster/blob/v2.2.3/service/core/api.go (technical-description)
- github.com/safing/portmaster/commit/f943e1eaf98f45bc48490bf288e1d63c04929ae0 (patch)
- github.com/safing/portmaster/releases/tag/v2.2.5 (release-notes)
- www.vulncheck.com/advisories/safing-portmaster-before-2.2.5-unauthenticated-for… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111664?
- CVE-2026-111664 is a medium-severity vulnerability in Safing Portmaster, classified under Missing Authentication for Critical Function. CVSS score: 4.4/10. Published 2026-10-16.
- How severe is CVE-2026-111664?
- Medium severity. CVSS v3 base score is 4.4 out of 10.