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