CVE-2026-40934
- Source
- https://cve.org/CVERecord?id=CVE-2026-40934
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-40934.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-40934
- Aliases
- Downstream
- Related
- Published
- 2026-05-05T21:31:42.897Z
- Modified
- 2026-07-27T03:32:13.779977774Z
- Severity
-
- 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 authentication cookies remain valid after password reset due to static cookie secret
- Details
-
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the secret used to sign authentication cookies is persisted to a static file at ~/.local/share/jupyter/runtime/jupytercookiesecret and is never rotated when a user changes their password. After a password reset and server restart, any previously issued authentication cookie remains cryptographically valid because the signing key has not changed. An attacker who has captured a session cookie through any means retains full authenticated access to the server regardless of subsequent password changes. This affects deployments using password-based authentication, particularly shared or public-facing servers where credential rotation is expected to revoke existing sessions. This issue has been fixed in version 2.18.0.
- Database specific
{ "cwe_ids": [ "CWE-613" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40934.json", "cna_assigner": "GitHub_M" }- References
Affected packages
Git / github.com/jupyter-server/jupyter_server
Affected ranges
- Type
- GIT
- Repo
- https://github.com/jupyter-server/jupyter_server
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "cpe": "cpe:2.3:a:jupyter:jupyter_server:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "2.18.0" } ], "source": [ "AFFECTED_FIELD", "CPE_RANGE" ] }