November 14, 2026

CVE Watchtower

CVE-2026-43984Cross-site Scripting (XSS)

NVDCVSS scored by security-advisories@github.com

Vulnerability Summary

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.
Severity Level
HIGH(8.9)
Published Date
Jun 4, 2026
Last Modified
Jul 22, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.21%Probability
Root Weakness (CWE)
CWE-79: Cross-site Scripting (XSS) β†—
The software does not neutralize user-controllable input before it is placed in output that is used as a web page.
CVSS v3.1 Base Metrics — Score 8.9 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow

Affected & Patched Versions

Affected Versions
Not provided by NVD for this CVE.
Patched Versions
No patched version published yet
Until a fix ships, reduce exposure:
  • Restrict access to the affected service or interface to trusted networks.
  • Disable the affected feature if you do not need it.
  • Watch the vendor advisory for a firmware or software update.

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

  1. Check whether you run the affected product and which version.
  2. No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
  3. Subscribe to the vendor advisory so you learn when a fix ships.

Timeline

  • Jun 4, 2026Published
  • Jul 22, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 14, 2026 17:12 UTC