Is this vulnerability remotely exploitable over the internet?

Yes, if OneUptime is exposed and a remote user can obtain project membership or equivalent permissions to define Synthetic Monitors, they can supply malicious JavaScript that triggers the sandbox escape without needing direct network access to the probe container.

What level of access does an attacker need to exploit this issue?

The attacker needs the ability to create or modify synthetic monitor scripts within a project. This is typically a legitimate application role (e.g., project member or maintainer), not necessarily an infrastructure-level account, which makes insider or account-takeover scenarios particularly concerning.

What is the safest general fix pattern for this class of bug?

The most robust fix is to avoid executing untrusted arbitrary code entirely. Replace generic JavaScript execution with a constrained, declarative configuration model for monitors, or run any required scripting in a heavily isolated, non-privileged environment that does not have access to sensitive credentials or the broader cluster.

Severity:

CRITICAL RISK

(9.9)

Remote Code Execution via Unsafe Sandbox Escape (CWE-94) in OneUptime Synthetic Monitors

CVE-2026-30887

Published:

Mar 10, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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May 6, 2026

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HIGH RISK

HIGH

(8.8)

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Remote Code Execution via Script Injection

CWE:

CWE-94

Impact:

Remote Code Execution and Cluster Compromise

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Remote Code Execution via Script Injection

CWE:

CWE-94

Impact:

Remote Code Execution and Cluster Compromise

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

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Remote Code Execution via Unsafe Sandbox Escape (CWE-94) in OneUptime Synthetic Monitors

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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