4.3Medium
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.
What this means for your business
- An attacker can use it remotely, over a network, with an ordinary user login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.3% chance of attack attempts being seen in the next 30 days, ranking above 19% of all known flaws.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
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Scoring
- CVSS
- 4.3 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L- CVSS v4
- 5.3
- Weakness
- CWE-862
- Assigned by
- disclosure@vulncheck.com
Dates
- Published
- 2026-09-05
- Last modified
- 2026-09-16
- Sources
- NVD
References
- https://github.com/sentriz/gonic
- https://github.com/sentriz/gonic/blob/v0.21.0/server/ctrlsubsonic/ctrl.go
- https://github.com/sentriz/gonic/blob/v0.21.0/server/ctrlsubsonic/handlers_common.go
- https://github.com/sentriz/gonic/releases/tag/v0.22.0
- https://github.com/sentriz/gonic/security/advisories/GHSA-453r-pgfw-h3pq
- https://www.vulncheck.com/advisories/gonic-before-0.22.0-missing-administrator-check-on-the-subsonic-startscan-endpoint