GHSA-qh7q-6qm3-653w

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Source
https://github.com/advisories/GHSA-qh7q-6qm3-653w
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qh7q-6qm3-653w/GHSA-qh7q-6qm3-653w.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-qh7q-6qm3-653w
Aliases
Downstream
CGA (4)
Published
2026-05-05T16:32:48Z
Modified
2026-07-17T21:12:47Z
Severity
  • 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N CVSS Calculator
Summary
Jupyter Server has an open redirection vulnerability in `next` query parameter
Details

Summary

The ?next=... URL query parameter has an open redirection vulnerability. In jupyter_server<=2.17.0, this URL query parameter allows redirection to arbitrary external domains, which can be exploited to facilitate phishing attacks on server users.

Details

The vulnerability is caused by insufficient validation in the LoginFormHandler._redirect_safe() method.

This vulnerability was originally reported by Noriaki Iwasaki. All discovery credit goes to them.

PoC

  1. Navigate to http://localhost:8888/login?next=///google.com
  2. Observe that the user is redirected to google.com despite it being an external domain.

The external domain passed in the ?next parameter may be replaced with a malicious lookalike to facilitate phishing attacks. Jupyter Server deployments served on a public domain are especially vulnerable, as prod.company.com may be redirected to a look-alike URL such as prod.company.dev.

Impact

This vulnerability affects all users, especially enterprise users who work with sensitive/confidential data.

Patches

Jupyter Server 2.18+

Workaround

None.

Database specific 
{
    "cwe_ids": [
        "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T16:32:48Z",
    "nvd_published_at": "2026-05-05T16:16:10Z",
    "severity": "MODERATE"
}
References

Affected packages

PyPI / jupyter-server

Package

Name
jupyter-server
View open source insights on deps.dev
Purl
pkg:pypi/jupyter-server

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.18.0

Affected versions

0.*
0.0.0
0.0.1
0.0.2
0.0.3
0.0.4
0.0.5
0.1.0
0.1.1
0.2.0
0.2.1
0.3.0
1.*
1.0.0rc0
1.0.0rc1
1.0.0rc2
1.0.0rc3
1.0.0rc4
1.0.0rc5
1.0.0rc6
1.0.0rc7
1.0.0rc8
1.0.0rc9
1.0.0rc10
1.0.0rc11
1.0.0rc12
1.0.0rc13
1.0.0rc14
1.0.0rc15
1.0.0rc16
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.0.9
1.0.10
1.0.11
1.1.0
1.1.1
1.1.2
1.1.3
1.1.4
1.2.0
1.2.1
1.2.2
1.2.3
1.3.0
1.4.0
1.4.1
1.5.0
1.5.1
1.6.0
1.6.1
1.6.2
1.6.3
1.6.4
1.7.0a1
1.7.0a2
1.7.0
1.8.0
1.9.0
1.10.0
1.10.1
1.10.2
1.11.0
1.11.1
1.11.2
1.12.0
1.12.1
1.13.0
1.13.1
1.13.2
1.13.3
1.13.4
1.13.5
1.15.0
1.15.1
1.15.2
1.15.3
1.15.4
1.15.5
1.15.6
1.16.0
1.17.0
1.17.1
1.18.0
1.18.1
1.19.0
1.19.1
1.21.0
1.23.0
1.23.1
1.23.2
1.23.3
1.23.4
1.23.5
1.23.6
1.24.0
2.*
2.0.0a0
2.0.0a1
2.0.0a2
2.0.0b0
2.0.0b1
2.0.0rc0
2.0.0rc1
2.0.0rc2
2.0.0rc3
2.0.0rc4
2.0.0rc5
2.0.0rc6
2.0.0rc7
2.0.0rc8
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.1.0
2.2.0
2.2.1
2.3.0
2.4.0
2.5.0
2.6.0
2.7.0
2.7.1
2.7.2
2.7.3
2.8.0
2.9.0
2.9.1
2.10.0
2.10.1
2.11.0
2.11.1
2.11.2
2.12.0
2.12.1
2.12.2
2.12.3
2.12.4
2.12.5
2.13.0
2.14.0
2.14.1
2.14.2
2.15.0
2.16.0
2.17.0

Database specific

last_known_affected_version_range 
"<= 2.17.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qh7q-6qm3-653w/GHSA-qh7q-6qm3-653w.json"