CVE-2026-33396Public exploitNetwork attack vector

Authenticated command execution via Playwright denylist bypass

Published Mar 26, 2026 · Updated Mar 26, 2026

Command injection in OneUptime before 10.0.35 allows remote authenticated users to execute arbitrary processes on the Probe host. VMRunner.runCodeInNodeVM passes a live Playwright page into the sandbox, whose incomplete blocked-property set permits traversal to _browserType.launchServer with attacker-controlled process arguments. ProjectMember access with monitor-creation rights is required; successful exploitation runs commands in the Probe container or host context.

CVSS severity9.9
Critical
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in OneUptime before 10.0.35 allows remote authenticated users to execute arbitrary processes on the Probe host. VMRunner.runCodeInNodeVM passes a live Playwright page into the sandbox, whose incomplete blocked-property set permits traversal to _browserType.launchServer with attacker-controlled process arguments. ProjectMember access with monitor-creation rights is required; successful exploitation runs commands in the Probe container or host context.

The record

CVE
CVE-2026-33396
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
OneUptime
Product
OneUptime
Classifications
CWE-78, CWE-693, CWE-184, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 10.0.35

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OneUptime · OneUptimeversion=< 10.0.35

Published CVSS scores

9.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-693Protection Mechanism Failure
CWE-184Incomplete List of Disallowed Inputs
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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