Tautulli up to 2.17.1 Auth Redirect plexpy/webauth.py redirect_uri

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Tautulli up to 2.17.1. The affected element is an unknown function of the file plexpy/webauth.py of the component Auth Redirect. The manipulation of the argument redirect_uri leads to redirect. This vulnerability is uniquely identified as CVE-2026-54915. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Tautulli up to 2.17.1 and classified as problematic. This issue affects an unknown functionality of the file plexpy/webauth.py of the component Auth Redirect. The manipulation of the argument redirect_uri with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. The summary by CVE is:

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to 2.17.2, the unauthenticated /auth/redirect endpoint in plexpy/webauth.py removes forward slashes from the user-controlled redirect_uri parameter but leaves tab, line-feed, and carriage-return characters intact. With the default root HTTP_ROOT configuration, CherryPy HTTPRedirect passes the resulting value to urllib.parse.urljoin, which can resolve the whitespace-bearing path to an attacker-controlled external origin. A user who follows a crafted link can therefore be redirected outside Tautulli for phishing or post-login redirect-flow abuse, while custom non-root HTTP_ROOT configurations are not affected by this bypass. This issue is fixed in version 2.17.2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-54915 since 06/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

Upgrading to version 2.17.2 eliminates this vulnerability.

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Productinfo

Name

• Tautulli

Version

• 2.17.0
• 2.17.1

Website

• Product: https://github.com/Tautulli/Tautulli/

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