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CVE-2026-30957: OneUptime Synthetic Monitor RCE via exposed Playwright browser object

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-10 · updated 2026-10-07
• Weakness: CWE-749

Description

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, OneUptime Synthetic Monitors allow a low-privileged authenticated project user to execute arbitrary commands on the oneuptime-probe server/container. The root cause is that untrusted Synthetic Monitor code is executed inside Node's vm while live host-realm Playwright browser and page objects are exposed to it. A malicious user can call Playwright APIs on the injected browser object and cause the probe to spawn an attacker-controlled executable. This is a server-side remote code execution issue. It does not require a separate vm sandbox escape. This vulnerability is fixed in 10.0.21.

Affected products

• oneuptime: before 10.0.21 — fixed in 10.0.21

How to fix

Upgrade to a fixed version: oneuptime 10.0.21. Check the vendor advisory for mitigations.

References

• https://github.com/OneUptime/oneuptime/releases/tag/10.0.21
• https://github.com/OneUptime/oneuptime/security/advisories/GHSA-jw8q-gjvg-8w4q

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