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CVE-2026-30921— OneUptime Synthetic Monitor RCE via exposed Playwright browser object

Quick assessment

Affected
OneUptime oneuptime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OneUptime是OneUptime开源的一个全面的解决方案。用于监控和管理您的在线服务。 OneUptime 10.0.20之前版本存在安全漏洞，该漏洞源于低权限用户可提交自定义Playwright代码，可能导致服务器端远程代码执行。

CVSS 10.0 · Critical EPSS 0.52% · P42
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I. Basic Information for CVE-2026-30921

Vulnerability Information
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Vulnerability Title
OneUptime Synthetic Monitor RCE via exposed Playwright browser object
Source: CVE Program / CVE List V5
Vulnerability Description
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.20, OneUptime Synthetic Monitors allow low-privileged project users to submit custom Playwright code that is executed on the oneuptime-probe service. In the current implementation, this untrusted code is run inside Node's vm and is given live host Playwright objects such as browser and page. This creates a distinct server-side RCE primitive: the attacker does not need the classic this.constructor.constructor(...) sandbox escape. Instead, the attacker can directly use the injected Playwright browser object to reach browser.browserType().launch(...) and spawn an arbitrary executable on the probe host/container. This vulnerability is fixed in 10.0.20.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
Source: CVE Program / CVE List V5
Vulnerability Title
OneUptime 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OneUptime是OneUptime开源的一个全面的解决方案。用于监控和管理您的在线服务。 OneUptime 10.0.20之前版本存在安全漏洞，该漏洞源于低权限用户可提交自定义Playwright代码，可能导致服务器端远程代码执行。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
OneUptime oneuptime < 10.0.20 -

II. Public POCs for CVE-2026-30921

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III. Intelligence Information for CVE-2026-30921

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Vendor Advisories for CVE-2026-30921 (1)

Same Patch Batch · OneUptime · 2026-03-09 · 3 CVEs total

CVE-2026-30887 10.0 CRITICAL OneUptime Affected by Unsandboxed Code Execution in Probe Allows Any Project Member to Ach
CVE-2026-30920 8.6 HIGH OneUptime has broken access control in GitHub App installation flow that allows unauthoriz

IV. Related Vulnerabilities

Same product: oneuptime
Same vendor: OneUptime
Same weakness: CWE-749

V. Comments for CVE-2026-30921

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