EUVD-2026-17208Severity by source
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionGitHub Advisory
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. From version 1.3.10 to before version 2.17.0, an unsanitized JSONP callback parameter allows cross-origin script injection and API key theft. This issue has been patched in version 2.17.0.
AnalysisAI
Cross-site scripting (XSS) in Tautulli 1.3.10 through 2.16.x allows remote attackers to inject malicious scripts via unsanitized JSONP callback parameters, enabling API key theft from authenticated users who click crafted links. The vulnerability requires social engineering (UI:A in CVSS) and affects the Plex monitoring tool's web interface. No public exploit or active exploitation (CISA KEV) confirmed at time of analysis, though the attack complexity is rated high (AC:H) suggesting practical exploitation requires specific conditions. GitHub security advisory indicates vendor-patched release available.
Technical ContextAI
Tautulli is a Python-based web application that monitors Plex Media Server activity and statistics. JSONP (JSON with Padding) is a legacy technique for cross-origin data sharing that executes callback functions specified in URL parameters. The vulnerability stems from CWE-79 (Cross-site Scripting) where the application fails to sanitize or validate the JSONP callback parameter before reflecting it in HTTP responses. When a callback parameter contains executable JavaScript instead of a valid function name, the browser executes arbitrary code in the context of the Tautulli web interface. This violates the same-origin policy and allows attackers to access session tokens, API keys, and other sensitive data stored in the application's authentication context. The CVSS vector indicates network-based attack (AV:N) requiring user interaction (UI:A) with high attack complexity (AC:H), suggesting exploitation depends on tricking authenticated users into visiting attacker-controlled URLs.
RemediationAI
Upgrade to Tautulli version 2.17.0 or later, which includes patches to properly sanitize JSONP callback parameters and prevent script injection. The patched release is available at https://github.com/Tautulli/Tautulli/releases/tag/v2.17.0 with installation instructions in the project documentation. As an interim mitigation for environments where immediate patching is not feasible, restrict network access to the Tautulli web interface using firewall rules or reverse proxy authentication to limit exposure to trusted administrators only. Additionally, educate users not to click untrusted links while authenticated to Tautulli. Review API keys and regenerate them if there is any suspicion of compromise. No workaround fully eliminates the vulnerability-upgrading to version 2.17.0 is the definitive remediation.
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External POC / Exploit Code
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