# CVE-2026-86118: gonic before 0.22.0 Missing Administrator Check on the Subsonic startScan Endpoint

> Authenticated users can trigger resource-intensive media scans due to missing admin checks, causing denial of service on gonic servers.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-453r-pgfw-h3pq, GHSA-58w8-8f5r-987p

## What is CVE-2026-86118?

CVE-2026-86118 is a medium-severity missing authorization vulnerability in sentriz gonic, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-86118?


## How do I fix CVE-2026-86118?

No fix has been published for CVE-2026-86118 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86118 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86118 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86118 and fix it if it is affected.

What it is: CVE-2026-86118 is a medium-severity missing authorization vulnerability in sentriz gonic, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86118 exists.

Affected product: sentriz gonic. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-86118/ (Markdown: https://insights.sbomify.com/CVE-2026-86118/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86118
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86118
- OSV: https://osv.dev/vulnerability/CVE-2026-86118

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86118/
Summaries are generated and may contain mistakes; the official description above is the record.