What is CVE-2026-30921?

CVE-2026-30921 is a critical-severity vulnerability in Oneuptime, classified under CWE-749. CVSS score: 10.0/10. Published 2026-03-09.

How severe is CVE-2026-30921?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Oneuptime

CVE-2026-30921

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…

EPSS: 0.000 (6.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Oneuptime — versions < 10.0.20

Weakness classification (CWE)

CWE-749

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-4j36-39gm-8vq8 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-30921?: CVE-2026-30921 is a critical-severity vulnerability in Oneuptime, classified under CWE-749. CVSS score: 10.0/10. Published 2026-03-09.
How severe is CVE-2026-30921?: Critical severity. CVSS v3 base score is 10.0 out of 10.