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PYSEC-2026-1482

LowCVSS 2.1 / 10

Published Jul 7, 2026·Last modified Jul 7, 2026

Affected Components(1)

jupyterlab

< 4.4.8

Description

Links generated with LaTeX typesetters in Markdown files and Markdown cells in JupyterLab and Jupyter Notebook did not include the noopener attribute.

This is deemed to have no impact on the default installations. Theoretically users of third-party LaTeX-rendering extensions could find themselves vulnerable to reverse tabnabbing attacks if:

links generated by those extensions included target=_blank (no such extensions are known at time of writing) and
they were to click on a link generated in LaTeX (typically visibly different from other links).

For consistency with handling on other links, new versions of JupyterLab will enforce noopener and target=_blank on all links generated by typesetters. The former will harden the resilience of JupyterLab to extensions with lack of secure defaults in link rendering, and the latter will improve user experience by preventing accidental state loss when clicking on links rendered by LaTeX typesetters.

Impact

Since the official LaTeX typesetter extensions for JupyterLab: jupyterlab-mathjax (default), jupyterlab-mathjax2 and jupyterlab-katex do not include the target=_blank, there is no impact for JupyterLab users.

Patches

JupyterLab 4.4.8

Workarounds

No workarounds are necessary.

References

None

Risk Scores

Base Score

2.1

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights.

Threat Intelligence

0.5

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS

0.21%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities

CVE-2025-59842
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to version 4.4.8, links generated with LaTeX typesetters in Markdown files and Markdown cells in JupyterLab and Jupyter Notebook did not include the noopener attribute. This is deemed to have no impact on the default installations. Theoretically users of third-party LaTeX-rendering extensions could find themselves vulnerable to reverse tabnabbing attacks if links generated by those extensions included target=_blank (no such extensions are known at time of writing) and they were to click on a link generated in LaTeX (typically visibly different from other links). This issue has been patched in version 4.4.8.
AliasLow 2.1

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