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

Source: https://junglewise.ai/threats/cve-2026-54915-tautulli-is-a-python-based-monitoring-and-tracking-tool-for-plex  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-21. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-54915 · Severity: medium · CVSS 5.4 · Published 2026-09-21

Tautulli is a monitoring tool for Plex Media Server that tracks playback and usage. An unauthenticated endpoint fails to properly validate redirect URLs, allowing an attacker to craft malicious links that redirect users to external phishing sites or abusive login-flow pages after they follow the attacker's link.

Technologies: [Tautulli](https://junglewise.ai/threats/technologies/tautulli). Vendors: [Tautulli](https://junglewise.ai/threats/vendors/tautulli).

## Quick answers

**Is CVE-2026-54915 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54915 being exploited in the wild.

**How severe is CVE-2026-54915?** Medium severity, with a CVSS score of 5.4, published 21 September 2026.

**Which products and versions are affected?** Tautulli before 2.17.2.

**Is there a fix for CVE-2026-54915?** A patch was published on 2026-06-16: Fix released in v2.17.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-54915 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-54915?** Check whether you run Tautulli at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The /auth/redirect endpoint in plexpy/webauth.py strips forward slashes from the user-controlled redirect_uri parameter but fails to remove tab, line-feed, and carriage-return characters. When CherryPy's HTTPRedirect passes this malformed URL to urllib.parse.urljoin, whitespace characters allow the path to resolve to an external attacker-controlled origin. The endpoint accepts unauthenticated requests with default HTTP_ROOT configuration; custom non-root configurations are unaffected.

## Affected products

- Tautulli Tautulli before 2.17.2

## Timeline

- 2026-09-21: disclosed
- 2026-06-16: patched: Fix released in v2.17.2

## References

- [https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd](https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd)
- [https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2](https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2)

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