PYSEC-2026-3472
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/jupyter-server/PYSEC-2026-3472.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-3472
- Aliases
- Published
- 2026-07-23T11:41:37.761563Z
- Modified
- 2026-07-23T15:00:15.106608390Z
- Severity
-
- 6.1 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
- Summary
- jupyter-server is vulnerable to CORS origin validation bypass when the `allow_origin_pat` configuration is used
- Details
-
A vulnerability in jupyter-server versions 1.12.0 through 2.17.0 allows an attacker to bypass CORS origin validation when the
allow_origin_patconfiguration is used. The issue arises from the use ofre.match()for validating theOriginheader, which only anchors at the start of the string. This allows attacker-controlled domains such astrusted.example.com.evil.comto pass validation against patterns intended to matchtrusted.example.com. The vulnerability affects multiple locations in the codebase, including CORS headers, WebSocket connections, referer validation, and login redirects, potentially enabling phishing attacks, arbitrary code execution, and unauthorized access to sensitive API responses. - References
Affected packages
PyPI / jupyter-server
Package
- Name
- jupyter-server
- View open source insights on deps.dev
- Purl
- pkg:pypi/jupyter-server
Affected versions
1.*
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