CVE-2026-35163
Received Received - Intake

Stored XSS in OctoPrint via Suppressed Command Notifications

Publication date: 2026-08-21

Last updated on: 2026-08-21

Assigner: GitHub, Inc.

Description
OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, Suppressed Command notification popups use PNotify rendering for printer-controlled payload.command and payload.message values in src/octoprint/static/js/app/viewmodels/terminal.js without HTML escaping. An attacker who convinces a victim to print a crafted file can inject HTML and JavaScript into the notification, disrupt prints, read information available to the victim including sensitive settings when permitted, or perform actions in the victim's OctoPrint session. This issue is fixed in versions 1.11.8 and 2.0.0rc3.

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Meta Information

Published
2026-08-21
Last Modified
2026-08-21
Generated
2026-08-21
AI Q&A
2026-08-21
EPSS Evaluated
N/A
NVD
CVE-2026-35163
EUVD
EUVD-2026-64043

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
octoprint octoprint to 1.11.8|end_excluding=2.0.0rc3 (exc)
octoprint octoprint to 1.11.7 (inc)
octoprint octoprint to 2.0.0rc2 (inc)
octoprint octoprint to 1.11.8 (inc)
octoprint octoprint to 2.0.0rc3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-80 The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.

Attack-Flow Graph

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Executive Summary

This is a Cross-Site Scripting (XSS) vulnerability in OctoPrint versions up to 1.11.7 and 2.0.0rc1/rc2. It allows injection of arbitrary HTML and JavaScript into Suppressed Command notification popups through unescaped user-supplied input (payload.command and payload.message) in the terminal.js file.

Detection Guidance

This vulnerability is specific to OctoPrint versions up to 1.11.7 and 2.0.0rc1/rc2. To detect it, check your OctoPrint version using the command: octoprint --version. If the output shows a version <=1.11.7 or 2.0.0rc1/rc2, the system is vulnerable.

Impact Analysis

An attacker could trick you into printing a crafted file to inject malicious scripts. This could disrupt prints, read sensitive settings if you have permissions, or perform unauthorized actions in your OctoPrint session.

Compliance Impact

This XSS vulnerability could lead to unauthorized access to sensitive information, which may violate GDPR's data protection requirements if personal data is exposed. For HIPAA, it could risk unauthorized disclosure of protected health information if the OctoPrint instance handles such data.

Mitigation Strategies

Upgrade OctoPrint to version 1.11.8 or 2.0.0rc3 or later. If upgrading is not immediately possible, disable popups for suppressed commands or ensure files are sourced only from trusted providers.

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