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CVE-2026-41065 Tautulli CVE debrief

CVE-2026-41065 is a high-severity remote code execution vulnerability in Tautulli, a Python-based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 are vulnerable to remote code execution via the newsletter custom template directory feature. On a fresh install before the setup wizard is completed, all management endpoints are completely unauthenticated. An attacker can create a newsletter agent, point the custom template directory to an attacker-controlled SMB share serving a malicious Mako template, and trigger execution via the newsletter render endpoint, all with zero credentials and no local access to the target system. On a completed install with credentials configured, the same chain is exploitable by any admin. Version 2.17.1 fixes the issue.

Vendor
Tautulli
Product
Unknown
CVSS
HIGH 8.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-22
Advisory published
2026-06-04
Advisory updated
2026-07-22

Who should care

Administrators and users of Tautulli, especially those with versions prior to 2.17.1, should be aware of this vulnerability and take immediate action to upgrade to the latest version.

Technical summary

The vulnerability exists in the newsletter custom template directory feature of Tautulli. An attacker can exploit this vulnerability by creating a newsletter agent, pointing the custom template directory to an attacker-controlled SMB share serving a malicious Mako template, and triggering execution via the newsletter render endpoint.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Tautulli version 2.17.1 or later.
  • Ensure that all management endpoints are properly authenticated and authorized.
  • Monitor for suspicious activity and implement additional security measures to prevent exploitation.

Evidence notes

CVE-2026-41065 has a CVSS score of 8.9 and is classified as HIGH severity. The vulnerability is addressed in Tautulli version 2.17.1.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41065 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41065

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41065 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41065

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.