Vulnerability in Hackerbay Oneuptime
CVE-2026-30957
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (63.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.011 · change: -0.001
Affected products
- Hackerbay Oneuptime
- Oneuptime — versions < 10.0.21
Weakness classification (CWE)
References
- github.com/OneUptime/oneuptime/security/advisories/GHSA-jw8q-gjvg-8w4q (Exploit, Vendor Advisory)
- github.com/OneUptime/oneuptime/releases/tag/10.0.21 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-30957?
- CVE-2026-30957 is a critical-severity vulnerability in Hackerbay Oneuptime, classified under CWE-749. CVSS score: 9.9/10. Published 2026-03-10.
- How severe is CVE-2026-30957?
- Critical severity. CVSS v3 base score is 9.9 out of 10.