CVE-2020-26261— user-readable api tokens in systemd units
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2020-26261
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
user-readable api tokens in systemd units
Source: NVD (National Vulnerability Database)
Vulnerability Description
jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
将资源暴露给错误范围
Source: NVD (National Vulnerability Database)
Vulnerability Title
JupyterHub 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterHub是一款用于Jupyter的多用户服务器。 jupyterhub-systemdspawner 存在安全漏洞，该漏洞源于systemdspawner允许JupyterHub使用systemd生成单用户笔记本服务器。在版本0.15之前，在systemd单元环境中指定发送给单用户服务器的用户API令牌。所有用户都不能正确地访问这些令牌。特别是，littlest-jupyterhub会受到影响，它默认使用systemdspawner。在jupyterhub-systemdspawner v0.
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 |
|---|---|---|---|---|
| jupyterhub | systemdspawner | < 0.15 | - |
II. Public POCs for CVE-2020-26261
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2020-26261
请登录查看更多情报信息。
- https://pypi.org/project/jupyterhub-systemdspawner/x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2020-26261
IV. Related Vulnerabilities
Same vendor: jupyterhub
- CVE-2026-34052
LTI JupyterHub Authenticator: Unbounded Memory Growth via No - CVE-2026-33709
JupyterHub has an Open Redirect Vulnerability - CVE-2026-33175
OAuthenticator: Authentication Bypass in Auth0OAuthenticator - CVE-2025-32428
Jupyter Remote Desktop Proxy makes TigerVNC accessible via t - CVE-2023-25574
JupyterHub's LTI13Authenticator: JWT signature not validated
Same weakness: CWE-668
- CVE-2026-41369
OpenClaw < 2026.3.31 - Insufficient Environment Variable San - CVE-2026-41368
OpenClaw < 2026.3.28 - Environment Variable Disclosure via j - CVE-2026-41362
OpenClaw 2026.2.19 < 2026.3.31 - Webhook Replay Dedupe Cache - CVE-2026-6830
Nesquena Hermes WebUI Environment Variable Credential Leakag - CVE-2026-32690
Apache Airflow: 3.x - Nested Variable Secret Values Bypass R
V. Comments for CVE-2020-26261
No comments yet