CVE-2026-43984: high-severity vulnerability in Tautulli
Tautulli has stored XSS in logFile via guest-controlled log_js_errors input
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.9epss 0.2%
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose `log_js_errors` to any authenticated user, including guest users when guest access is enabled. The endpoint writes attacker-controlled strings directly into the main application log. The administrator-only `logFile` view then reads that log file and embeds it into an HTML response without escaping. This creates a stored cross-site scripting condition where a low-privilege guest can inject HTML or JavaScript into the log file and have it execute in an administrator's browser when the log viewer is opened. Version 2.17.1 patches the issue.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Affected products
Tautulli · TautulliRelated CVEs — Tautulli
In the same product, most dangerous first.
CVE-2026-31831HIGHTautulli: Unauthenticated Path Traversal in `/newsletter/image/images` endpointEPSS 2.0%CVE-2025-58763HIGHTautulli vulnerable to Authenticated Remote Code Execution via Command InjectionEPSS 1.7%CVE-2025-58762CRITICALTautulli vulnerable to Authenticated Remote Code Execution via write primitive and `Script` notification agentEPSS 0.8%CVE-2025-58761HIGHTautulli vulnerable to Unauthenticated Path Traversal in `real_pms_image_proxy`EPSS 0.7%CVE-2025-58760HIGHTautulli vulnerable to Unauthenticated Path Traversal in `/image` endpointEPSS 0.6%CVE-2026-49995MEDIUMTautulli: Stored Cross-Site Scripting (XSS) in the newsletterEPSS 0.6%