GHSA-5mrq-x3x5-8v8f

Suggest an improvement
Source
https://github.com/advisories/GHSA-5mrq-x3x5-8v8f
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-5mrq-x3x5-8v8f/GHSA-5mrq-x3x5-8v8f.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-5mrq-x3x5-8v8f
Aliases
Downstream
CGA (4)
Published
2026-05-05T17:03:24Z
Modified
2026-09-10T03:50:45Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Jupyter Server's Authentication Cookies Remain Valid After Password Reset and Server Restart
Details

Summary

A persistent cookie secret vulnerability allows authenticated users to maintain indefinite access even after password changes.

The cookie secret used to sign authentication cookies is stored in a permanent file (~/.local/share/jupyter/runtime/jupyter_cookie_secret) that is never automatically rotated or cleared, allowing stolen or compromised cookies to remain valid indefinitely regardless of password resets.

PoC

  • Start a Jupyter server with password authentication: jupyter server password, jupyter server
  • Log in with the password and capture the authentication cookie (e.g., just login with a browser).
  • Change the password to revoke access: jupyter server password
  • Restart the server
  • Use the old stolen cookie => remains valid and provides full authenticated access.

Impact

  • All jupyter-server deployments using password authentication where security incidents may occur
  • Multi-user systems where one user's compromised session should be revocable by administrators
  • Shared or public-facing Jupyter servers where credential rotation is a security requirement
  • Any deployment where password changes are expected to revoke existing sessions

Patches

Jupyter Server 2.18+

Workaround

rm ~/.local/share/jupyter/runtime/jupyter_cookie_secret
# Then restart the server
Database specific 
{
    "cwe_ids":  [
        "CWE-613"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-05T17:03:24Z",
    "nvd_published_at":  "2026-05-05T22:16:00Z",
    "severity":  "HIGH"
}
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-5mrq-x3x5-8v8f/GHSA-5mrq-x3x5-8v8f.json"