How broadly exploitable is this vulnerability?

Exploitation is limited to authenticated users who can define or modify Synthetic Monitor Playwright scripts, but within that scope it is highly impactful: a low-privileged ProjectMember can achieve command execution on Probe infrastructure.

What level of access does an attacker need?

The attacker needs valid credentials and project membership with permissions to configure or edit Synthetic Monitor scripts. No direct shell or container access is required; the attack is carried out through the application's monitoring interface.

What is the safest general fix pattern?

The most robust fix is to redesign the execution model so that user code runs against a tightly controlled, allowlisted API in a strongly isolated environment, rather than relying on a denylist of forbidden properties on a powerful object like a live Playwright `page`.

Severity:

CRITICAL RISK

(9.9)

Remote Command Execution via Incomplete Sandbox Denylist (CWE-78) in OneUptime Synthetic Monitor Playwright Runner

CVE-2026-33396

Published:

Mar 26, 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

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Remote Code Execution via Sandbox Escape

CWE:

CWE-78;CWE-184;CWE-693

Impact:

Remote Command Execution by Low-Privileged Authenticated Users

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Remote Code Execution via Sandbox Escape

CWE:

CWE-78;CWE-184;CWE-693

Impact:

Remote Command Execution by Low-Privileged Authenticated Users

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

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Remote Command Execution via Incomplete Sandbox Denylist (CWE-78) in OneUptime Synthetic Monitor Playwright Runner

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

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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