OctoPrint up to 1.11.7/2.0.0rc2 Notification Popups terminal.js cross site scripting

Summaryinfo

A vulnerability has been found in OctoPrint up to 1.11.7/2.0.0rc2 and classified as problematic. Affected is an unknown function of the file src/octoprint/static/js/app/viewmodels/terminal.js of the component Notification Popups. Performing a manipulation results in cross site scripting. This vulnerability was named CVE-2026-35163. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in OctoPrint up to 1.11.7/2.0.0rc2. This affects an unknown part of the file src/octoprint/static/js/app/viewmodels/terminal.js of the component Notification Popups. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-35163 since 04/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.11.8 or 2.0.0rc3 eliminates this vulnerability.

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Productinfo

Name

• OctoPrint

Version

• 1.11.0
• 1.11.1
• 1.11.2
• 1.11.3
• 1.11.4
• 1.11.5
• 1.11.6
• 1.11.7
• 2.0.0rc1
• 2.0.0rc2

Website

• Product: https://github.com/OctoPrint/OctoPrint/

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