CVE-2026-40934— jupyter-server authentication cookies remain valid after password reset due to static cookie secret
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I. Basic Information for CVE-2026-40934
Vulnerability Information
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Vulnerability Title
jupyter-server authentication cookies remain valid after password reset due to static cookie secret
Source: NVD (National Vulnerability Database)
Vulnerability Description
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/jupyter_cookie_secret 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的会话过期机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Jupyter Server 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jupyter Server是Jupyter组织的一款用于为Jupyter Web应用提供后端服务的应用软件。 Jupyter Server 2.17.0及之前版本存在代码问题漏洞，该漏洞源于用于签名认证cookie的密钥持久化到静态文件且用户更改密码后不轮换，可能导致攻击者通过捕获的会话cookie在密码更改后仍保持完全认证访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| jupyter-server | jupyter_server | < 2.18.0 | - |
II. Public POCs for CVE-2026-40934
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · jupyter-server · 2026-05-05 · 4 CVEs total
| CVE-2025-61669 | jupyter_server next parameter open redirect can redirect users to external domains | |
| CVE-2026-35397 | jupyter-server path traversal allows access to sibling directories sharing root_dir name p | |
| CVE-2026-40110 | jupyter-server CORS origin validation bypass via unanchored regex in allow_origin_pat |
IV. Related Vulnerabilities
Same product: jupyter_server
- CVE-2026-40110
jupyter-server CORS origin validation bypass via unanchored - CVE-2026-35397
jupyter-server path traversal allows access to sibling direc - CVE-2025-61669
jupyter_server next parameter open redirect can redirect use - CVE-2024-35178
Jupyter server on Windows discloses Windows user password ha - CVE-2023-49080
Jupyter Server errors include tracebacks with path informati
Same vendor: jupyter-server
- CVE-2026-40110
jupyter-server CORS origin validation bypass via unanchored - CVE-2026-35397
jupyter-server path traversal allows access to sibling direc - CVE-2025-61669
jupyter_server next parameter open redirect can redirect use - CVE-2024-35178
Jupyter server on Windows discloses Windows user password ha - CVE-2024-28188
jupyter-scheduler's endpoint is missing authentication
Same weakness: CWE-613
- CVE-2026-41902
FreeScout's user invitation hash never expires: permanent un - CVE-2026-41519
Weblate's API Token Not Invalidated on Password Change - CVE-2026-41891
CI4MS: Deactivated User Session Bypass (active=0) - CVE-2026-42421
OpenClaw < 2026.4.8 - WebSocket Session Persistence via Shar - CVE-2026-41916
OpenClaw < 2026.4.8 - Stale Authentication State via Config
V. Comments for CVE-2026-40934
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