CVE-2026-43985
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
Tautulli versions prior to 2.17.1 do not enforce POST method on the `configUpdate` endpoint and lack anti-CSRF tokens. An attacker can trick a logged-in administrator into visiting a malicious page that submits a cross-site request, overwriting the admin username and password, leading to administrative interface takeover.
Risk Assessment
Risk of admin account takeover and full control over Tautulli, potentially leading to unauthorized access to Plex Media Server data.
Recommendation
Immediately upgrade Tautulli to version 2.17.1 or later, which includes a fix for the CSRF vulnerability.
Other vulnerabilities in Tautulli
See all- CVE-2026-43986Critical
Tautulli 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 server-side image fetch logic. A low-privilege guest user can seed a malicious external image URL into this lookup table and trigger server-side fetches through an unauthenticated endpoint, turning an authenticated SSRF primitive into a persistent unauthenticated SSRF gadget.
- CVE-2026-43984High
Tautulli is a monitoring tool for Plex Media Server. Prior to 2.17.1, the `log_js_errors` endpoint is accessible to any authenticated user, including guests. It writes attacker-controlled strings to the application log. The admin-only `logFile` view reads the log and embeds it into HTML without escaping, causing stored XSS. A guest can inject HTML/JavaScript that executes in an administrator's browser.
- CVE-2026-41065High
Tautulli prior to 2.17.1 is vulnerable to remote code execution via the newsletter custom template directory feature. On a fresh install before setup wizard completion, all management endpoints are unauthenticated. An attacker can create a newsletter agent, point the template directory to a malicious SMB share with a Mako template, and trigger execution via the newsletter render endpoint.
- CVE-2026-40605Medium
Tautulli before version 2.17.1 has a path traversal vulnerability in the cache deletion endpoint. An authenticated attacker can delete directories outside the configured cache path, leading to data loss and service disruption. Fixed in version 2.17.1.
Original NVD description (English source)
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose `configUpdate` as a state-changing administrator endpoint, but the route does not enforce `POST` and does not use any anti-CSRF token. In the default form and JWT-based authentication mode, the administrator session cookie is issued with `SameSite=Lax`, which still permits top-level cross-site navigation requests. An attacker can exploit this by luring a logged-in administrator to a malicious page that submits a cross-site request to `/configUpdate` and overwrites the local administrator username and password. The attacker can then sign in directly with the chosen credentials and take over the Tautulli administrative interface. Version 2.17.1 patches the issue.