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

Quick assessment

Affected
Tautulli Tautulli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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,

CVSS 5.4 · Medium EPSS 0.21% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
Tautulli Tautulli < 2.17.2 affected
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I. Basic Information for CVE-2026-54915

Vulnerability Information

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Vulnerability Title
Tautulli: Open redirect via whitespace bypass in /auth/redirect
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tautulli Tautulli < 2.17.2 -

II. Public POCs for CVE-2026-54915

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III. Intelligence Information for CVE-2026-54915

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Patches & Fixes for CVE-2026-54915 (1)

Other References for CVE-2026-54915 (2)

Same Patch Batch · Tautulli · 2026-09-21 · 4 CVEs total

CVE-2026-52835 7.0 HIGH Tautulli: Path traversal / arbitrary file write via unsanitized upload filename in import_
CVE-2026-45381 5.1 MEDIUM Tautulli: Reflected XSS in `/search` endpoint
CVE-2026-49995 4.8 MEDIUM Tautulli: Stored Cross-Site Scripting (XSS) in the newsletter

IV. Related Vulnerabilities

Same product: Tautulli
Same vendor: Tautulli
Same weakness: CWE-601

V. Comments for CVE-2026-54915

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