What’s Vulnerable › Vulnerabilities

CVE-2026-54915: Tautulli: Open redirect via whitespace bypass in /auth/redirect

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-24
• Weakness: CWE-601

Description

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.

Affected products

• Tautulli: before 2.17.2

References

• https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd
• https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2
• https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm
• https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm

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