CVE-2026-43986
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose a public `/image/<hash>` route that resolves attacker-controlled entries from `image_hash_lookup` and replays them through the same server-side image fetch logic used by authenticated image proxying. A low-privilege guest user can seed a malicious external image URL into this lookup table and then trigger server-side fetches through a fully unauthenticated endpoint. This turns an authenticated SSRF primitive into a persistent unauthenticated SSRF gadget. Once the malicious hash entry exists, any external user can request `/image/<hash>.png` and cause the PMS or Tautulli host to fetch an arbitrary attacker-chosen URL. Version 2.17.1 patches the issue.
- Score
- CVSS 3.1 9.9 Critical
- Status
- Deferred - security-advisories@github.com
- Published
- 2026-06-04
- Last modified
- 2026-06-04
- Weaknesses
- CWE-918
Affected products
References
- https://github.com/Tautulli/Tautulli/releases/tag/v2.17.1
- https://github.com/Tautulli/Tautulli/security/advisories/GHSA-m6j6-rc2c-8vpm
