CVE-2026-49995
Deferred Deferred - Pending Action

Stored XSS in Tautulli Newsletter Configuration

Publication date: 2026-09-21

Last updated on: 2026-09-21

Assigner: GitHub, Inc.

Description
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to 2.17.2, the newsletter cron field stored in the newsletters table is inserted by data/interfaces/default/newsletter_config.html into a JavaScript string without safe JSON encoding. An administrator or caller with the Tautulli API key can store a crafted cron value, and an administrator who later opens the newsletter configuration modal passively triggers script execution in the Tautulli web context. The stored value persists in the database and can continue to execute after credential rotation until it is removed. This issue is fixed in version 2.17.2.

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Meta Information

Published
2026-09-21
Last Modified
2026-09-21
Generated
2026-09-22
AI Q&A
2026-09-21
EPSS Evaluated
N/A
NVD
CVE-2026-49995
EUVD
EUVD-2026-84069

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
tautulli tautulli 2.17.2
tautulli tautulli to 2.17.2 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

CVE-2026-49995 is a Stored Cross-Site Scripting (XSS) vulnerability in Tautulli affecting versions 2.17.1 and earlier. An authenticated administrator or API key holder can inject malicious JavaScript into the newsletter cron field by saving an arbitrary string to the newsletters table. When another administrator opens the newsletter configuration modal, the injected script executes in the Tautulli web UI context.

Detection Guidance

Check if your Tautulli version is below 2.17.2. Inspect the newsletter cron field in the newsletters table for suspicious JavaScript payloads. Look for unexpected script execution in the newsletter configuration modal.

Impact Analysis

This vulnerability allows attackers with administrative access or API key to execute malicious scripts in the context of the Tautulli web UI. The impact includes potential theft of session cookies, unauthorized actions performed by the victim, and persistent compromise even after credential rotation since the payload remains in the database until manually removed.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling unauthorized script execution in the Tautulli web interface. An attacker could inject malicious JavaScript to steal session cookies, manipulate UI elements, or exfiltrate sensitive data, which may violate data protection requirements under these regulations.

Mitigation Strategies

Upgrade Tautulli to version 2.17.2 or later. Review the newsletters table for malicious cron values and remove any suspicious entries. Rotate API keys and credentials as a precaution.

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