What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-09-30
• Weakness: CWE-602

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.

Affected products

• jupyterlab: from 4.6.0 through 4.6.1; from 4.1.0 through 4.5.9

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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