Vulnerability · Published Jun 4, 2026 · Assigned by GitHub_M

CVE-2026-43984Tautulli has stored XSS in logFile via guest-controlled log_js_errors input

High 8.9

In plain English

A high-severity cross-site scripting in Tautulli from Tautulli. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)8.9High

Exploit odds (30 days)0.2%top 89.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Tautulli	Tautulli	< 2.17.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

References

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