CVE-2025-59842Network attack vector

Tab redirection via unhardened LaTeX links

Published Sep 26, 2025 · Updated Sep 26, 2025

Reverse tabnabbing in JupyterLab before 4.4.8 allows remote attackers to redirect an opener tab through crafted LaTeX links. LaTeX typesetter output in Markdown files and cells left generated anchors without rel=noopener, preserving window.opener access for a target opened in a new tab. Exploitation requires a third-party typesetter that emits target=_blank and a user click; official typesetters do not, so default installations have no impact.

CVSS severity2.1
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reverse tabnabbing in JupyterLab before 4.4.8 allows remote attackers to redirect an opener tab through crafted LaTeX links. LaTeX typesetter output in Markdown files and cells left generated anchors without rel=noopener, preserving window.opener access for a target opened in a new tab. Exploitation requires a third-party typesetter that emits target=_blank and a user click; official typesetters do not, so default installations have no impact.

The record

CVE
CVE-2025-59842
Published
Sep 26, 2025
Updated
Sep 26, 2025
Vendor
Project Jupyter
Product
JupyterLab
Classifications
CWE-1022
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Project Jupyter · JupyterLabversion=< 4.4.8

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
2.1GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1022Use of Web Link to Untrusted Target with window.opener Access

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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