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CVE-2023-36821— Uptime Kuma vulnerable to authenticated remote code execution via malicious plugin installation

Quick assessment

Affected
louislam uptime-kuma
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Uptime Kuma是Louis Lam个人开发者的一个易于使用的自托管监控工具。 Uptime Kuma 1.22.1之前版本存在输入验证错误漏洞，该漏洞源于允许经过身份验证的攻击者安装恶意制作的插件，这可能会导致远程代码执行。

CVSS 8.8 · High EPSS 2.02% · P80
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I. Basic Information for CVE-2023-36821

Vulnerability Information
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Vulnerability Title
Uptime Kuma vulnerable to authenticated remote code execution via malicious plugin installation
Source: CVE Program / CVE List V5
Vulnerability Description
Uptime Kuma, a self-hosted monitoring tool, allows an authenticated attacker to install a maliciously crafted plugin in versions prior to 1.22.1, which may lead to remote code execution. Uptime Kuma allows authenticated users to install plugins from an official list of plugins. This feature is currently disabled in the web interface, but the corresponding API endpoints are still available after login. After downloading a plugin, it's installed by calling `npm install` in the installation directory of the plugin. Because the plugin is not validated against the official list of plugins or installed with `npm install --ignore-scripts`, a maliciously crafted plugin taking advantage of npm scripts can gain remote code execution. Version 1.22.1 contains a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Uptime Kuma 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Uptime Kuma是Louis Lam个人开发者的一个易于使用的自托管监控工具。 Uptime Kuma 1.22.1之前版本存在输入验证错误漏洞，该漏洞源于允许经过身份验证的攻击者安装恶意制作的插件，这可能会导致远程代码执行。
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
louislam uptime-kuma < 1.22.1 -

II. Public POCs for CVE-2023-36821

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: RCE via malicious plugin npm postinstall — command executed in server as 0 root , proof token exfiltrated: PROOF_a53d387ac0f45349
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 6154 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
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III. Intelligence Information for CVE-2023-36821

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Patches & Fixes for CVE-2023-36821 (1)

Vendor Advisories for CVE-2023-36821 (1)

Other References for CVE-2023-36821 (2)

IV. Related Vulnerabilities

Same product: uptime-kuma
Same vendor: louislam
Same weakness: CWE-20

V. Comments for CVE-2023-36821

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