Bug 2550634 (CVE-2026-102832)

Summary: CVE-2026-102832 jupyterlab: JupyterLab: Improper trust assignment via active document switching
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in JupyterLab. This vulnerability allows an untrusted document to gain trusted status without intended user authorization. When a trust confirmation prompt is displayed, switching the active document causes JupyterLab to grant trust to whichever document is currently focused rather than the document that triggered the prompt. Consequently, an attacker could convince a user to open an untrusted notebook that unintentionally receives trusted status, enabling embedded commands to execute without prompts.
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Description OSIDB Bzimport 2026-10-13 15:42:00 UTC 
JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.5.7 until 4.5.11 and 4.6.4, the markdownviewer:trust and notebook:trust command-link handlers use tracker.currentWidget to resolve the current Markdown viewer or notebook when the user answers rather than retaining the document whose command button was clicked. If another document becomes current while the prompt is open and the user chooses Trust, JupyterLab marks the second document trusted while leaving the clicked document untrusted. Later command buttons in the incorrectly trusted document run without a prompt, and trusting a notebook marks all cells trusted, saves unsaved edits, and persists the server signature to disk. Applications that bundle JupyterLab, including affected Notebook and JupyterLite releases, inherit the behavior. This issue is fixed in versions 4.5.11 and 4.6.4.