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Vulnerability record · CVE-2026-43984 · published 4 June 2026

CVE-2026-43984: Cross-site scripting vulnerability

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.

8.9 CVSS 3.1 High EPSS 0.37% · top 72.1% CWE-79 · Cross-site scripting Deferred
8.9CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Jul 2026Last modified by NVD

Description

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

References

LinkTags
https://github.com/Tautulli/Tautulli/releases/tag/v2.17.1
https://github.com/Tautulli/Tautulli/security/advisories/GHSA-f4j7-pjwc-4jrr
https://github.com/Tautulli/Tautulli/security/advisories/GHSA-f4j7-pjwc-4jrr

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Source: NIST National Vulnerability Database (record CVE-2026-43984), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.