# CVE-2026-77385: Kyoo: Transcoder serves uncataloged files from the media directory

> A registered user can retrieve uncataloged files from the media directory by bypassing catalog-level authorization checks in the transcoder.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A: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:** 18 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-fc8v-vr3q-hc46

## What is CVE-2026-77385?

CVE-2026-77385 is a medium-severity missing authorization vulnerability in zoriya Kyoo, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Kyoo is a self-hosted media server focused on movies, series, and anime. Prior to 5.1.0, a registered user with the core.play permission could supply a base64-encoded filesystem path to the transcoder. The path handling in transcoder/src/api/path.go cleaned the value and checked only that it began with Settings.SafePath before getHash processed it, while transcoder/src/api/streams.go served the accepted path without verifying a Kyoo catalog record. This missing catalog-level authorization allowed the user to retrieve hidden, temporary, operational, or other uncataloged files beneath the media directory when the path was known or guessed. This vulnerability is fixed in 5.1.0.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-77385?


## How do I fix CVE-2026-77385?

No fix has been published for CVE-2026-77385 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-77385 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77385 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-77385 and fix it if it is affected.

What it is: CVE-2026-77385 is a medium-severity missing authorization vulnerability in zoriya Kyoo, published on 18 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-2026-77385 exists.

Affected product: zoriya Kyoo. 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-2026-77385/ (Markdown: https://insights.sbomify.com/CVE-2026-77385/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-77385
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77385
- OSV: https://osv.dev/vulnerability/CVE-2026-77385

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-77385/
Summaries are generated and may contain mistakes; the official description above is the record.