livebook-dev Livebook up to 0.18.6/0.19.8 Keyboard Shortcuts js_view.js cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in livebook-dev Livebook up to 0.18.6/0.19.8. This impacts an unknown function of the file assets/js/hooks/js_view.js of the component Keyboard Shortcuts. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2026-66298. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in livebook-dev Livebook up to 0.18.6/0.19.8. It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the file assets/js/hooks/js_view.js of the component Keyboard Shortcuts. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. The summary by CVE is:

Origin Validation Error vulnerability in livebook-dev livebook allows untrusted notebook output JavaScript to trigger session-wide keyboard shortcuts, including forced evaluation of all cells and runtime restart. Livebook's JS-view feature renders notebook-defined JavaScript inside a sandboxed, cross-origin iframe specifically because that JavaScript is untrusted. The trusted iframe shell in iframe/priv/static/iframe/v5.html forwards every keydown event fired in its own window to the parent page without consulting Event.isTrusted, so an event synthesized by the untrusted script through window.dispatchEvent is forwarded exactly as a genuine keystroke would be. The parent-side relay in assets/js/hooks/js_view.js reconstructs and re-dispatches it on the live page with no further validation, and because assets/js/hooks/session.js registers the global shortcut handler on the document in the capture phase, that handler acts on the replicated event regardless of how it was produced. Sandboxed output JavaScript can therefore drive Livebook's session-wide keyboard shortcuts. Two of them reach LivebookWeb.SessionLive and execute immediately with no confirmation: the shortcut for queueing full evaluation runs every cell in the notebook, and the shortcut for reconnecting the runtime disconnects and reconnects it, discarding in-memory state. A third shortcut deletes the focused cell behind a confirmation dialog that the user can permanently dismiss, after which it too executes silently. Forced full evaluation is the significant consequence, because it causes the notebook's own Elixir code to run without the user choosing to evaluate anything. A user who merely opens a notebook obtained from a third party, or reached from published documentation, can have its code executed on their runtime. Livebook also mirrors cell outputs to every connected client, so a malicious output triggers in a collaborator's browser as soon as it renders. This issue affects livebook: from 0.5.0 before 0.18.7 and from 0.19.0 before 0.19.9.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-66298 since 07/24/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 0.18.7 or 0.19.9 eliminates this vulnerability.

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Productinfo

Vendor

• livebook-dev

Name

• Livebook

Version

• 0.18.0
• 0.18.1
• 0.18.2
• 0.18.3
• 0.18.4
• 0.18.5
• 0.18.6
• 0.19.0
• 0.19.1
• 0.19.2
• 0.19.3
• 0.19.4
• 0.19.5
• 0.19.6
• 0.19.7
• 0.19.8

Website

• Product: https://github.com/livebook-dev/livebook/

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