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Not in CISA KEV
MEDIUM severity

Open Redirect Vulnerability in jupyter-serverGHSA-r726-vmfq-j9j3

MEDIUMFix: jupyter-server/jupyter_server@2903625

GHSA-r726-vmfq-j9j3 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in jupyter-server. A fix is available for jupyter-server — see the affected versions and patch details below.

Also known asCVE-2023-39968PYSEC-2023-155
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-r726-vmfq-j9j3.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.00%0.39%0.79%1.18%0.4%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍jupyter-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Open Redirect Vulnerability. Maliciously crafted login links to known Jupyter Servers can cause successful login or an already logged-in session to be redirected to arbitrary sites, which should be restricted to Jupyter Server-served URLs.

Patches

Upgrade to Jupyter Server 2.7.2

Workarounds

None.

References

Vulnerability reported by user davwwwx via the bug bounty program sponsored by the European Commission and hosted on the Intigriti platform.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIjupyter-serverall versions2.7.2pip install --upgrade 'jupyter-server==2.7.2'

Affected Products

1 product · 1 configurations
Application
jupyter serverjupyter
< 2.7.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jupyter-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update jupyter-server to 2.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r726-vmfq-j9j3 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact Open Redirect Vulnerability. Maliciously crafted login links to known Jupyter Servers can cause successful login or an already logged-in session to be redirected to arbitrary sites, which should be restricted to Jupyter Server-served URLs. ### Patches Upgrade to Jupyter Server 2.7.2 ### Workarounds None. ### References Vulnerability reported by user davwwwx via the [bug bounty program](https://app.intigriti.com/programs/jupyter/jupyter/detail) [sponsored by the European Commission](https://commission.europa.eu/news/european-commissions-open-source-programme-office-starts-bu
O3 Security · Impact-Aware SCA

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Open Redirect Vulnerability in jupyter-server (Medium 6.1)