What is the CVSS score of CVE-2026-30921?

CVE-2026-30921 has a CVSS 3.1 base score of 9.9 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of AI / ML are affected by CVE-2026-30921?

OneUptime Synthetic Monitors contain a critical remote code execution vulnerability (CVSS 9.9) that allows low-privileged users to execute arbitrary code on monitoring infrastructure.. A patch is available.

Is there a public PoC exploit available for CVE-2026-30921?

Yes, a public proof-of-concept exploit is available for CVE-2026-30921. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-30921?

Within 24 hours: Audit OneUptime user access and synthetic monitor configurations; isolate OneUptime-probe services from sensitive networks; disable synthetic monitor functionality if business-critical. Within 7 days: Implement network segmentation to restrict probe service lateral movement; enforce principle of least privilege for OneUptime user accounts; establish logging/monitoring of custom Playwright code submissions. Within 30 days: Upgrade to OneUptime 10.0.20 or later; conduct forensic review of synthetic monitor history for suspicious code; perform full security assessment of monitoring infrastructure.

AI / ML CVE-2026-30921

CRITICAL

Exposed Dangerous Method or Function (CWE-749)

2026-03-10 security-advisories@github.com

GHSA-4j36-39gm-8vq8

RCE AI / ML Oneuptime

9.9

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.9 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Mar 12, 2026 - 13:44 vuln.today

Public exploit code

CVE Published

Mar 10, 2026 - 17:40 nvd

CRITICAL 9.9

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 npm packages depend on @oneuptime/common (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 10.0.20.

DescriptionGitHub Advisory

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.