CVE-2026-86118: Auth Bypass (CVSS 4.3)

Description

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.

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CVSS v3.1 Score

4.3

MEDIUM

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

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other 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 https://github.com/sentriz/gonic/security/advisories/GHSA-453r-pgfw-h3pq

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-86118? +

CVE-2026-86118 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-86118? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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