Auth bypass in Jupyterlab
CVE-2026-102832
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.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Jupyterlab — versions >= 4.5.7, < 4.5.11, >= 4.6.0, < 4.6.4
- Jupyterlab Jupyterlite-Core — versions >= 0.7.5, < 0.8.4
- Jupyterlab Notebook — versions >= 7.5.6, < 7.6.3
Weakness classification (CWE)
References
- github.com/jupyterlab/jupyterlab/security/advisories/GHSA-jwrc-gm9j-263p
- github.com/jupyterlab/jupyterlab/commit/0fc18ab4ef67e431a8f6560e387193baf786c70a
- github.com/jupyterlab/jupyterlab/commit/b64bc88b8ca034cf158604a5cc48ca9170ea453b
- github.com/jupyterlab/jupyterlab/commit/f7e5f9803fdf2aaaa0e9bfb9cc73386a8cc5f0b2
- github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11
- github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4
Frequently asked questions
- What is CVE-2026-102832?
- CVE-2026-102832 is a medium-severity vulnerability in Jupyterlab, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.2/10. Published 2026-10-13.
- How severe is CVE-2026-102832?
- Medium severity. CVSS v3 base score is 4.2 out of 10.