Auth bypass in Sentriz Gonic
CVE-2026-86118
gonic versions before 0.22.0 fail to validate administrator privileges in the startScan endpoint, allowing any authenticated user to trigger media library rescans. Attackers can repeatedly call the startScan endpoint to force CPU and I/O-intensive filesystem operations, causing denial of service on multi-user instances.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (39.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/sentriz/gonic (product)
- /startScan registered on the plain auth chain (technical-description)
- ServeStartScan without an admin check (technical-description)
- gonic v0.22.0 Release Notes (release-notes)
- GitHub Security Advisory (GHSA-453r-pgfw-h3pq) (vendor-advisory)
- VulnCheck Advisory: gonic before 0.22.0 Missing Administrator Check on the Subsonic startScan Endpoint (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86118?
- CVE-2026-86118 is a medium-severity vulnerability in Sentriz Gonic, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-09-05.
- How severe is CVE-2026-86118?
- Medium severity. CVSS v3 base score is 4.3 out of 10.