CVE-2026-30957

OneUptime Synthetic Monitor RCE via exposed Playwright browser object

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

OneUptime · oneuptime

CVSS v3.1 GITHUB

9.9 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

1.20% chance of exploitation in the next 30 days, 68th percentile

Published

2026-03-10

Proof-of-concept exploits (1)

• advisories/GHSA-jw8q-gjvg-8w4q

Security advisories

• OneUptime/oneuptime/security/advisories/GHSA-jw8q-gjvg-8w4q
• OneUptime/oneuptime/releases/tag/10.0.21

References

• CVE Record
• NVD entry