CVE-2026-33396: OneUptime is an open-source monitoring and observability platform

Q: How do I fix CVE-2026-33396?

oneuptime: upgrade to 10.0.35. Exact commands for each OS are on this page.

Q: Is CVE-2026-33396 being exploited?

CVE-2026-33396 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33396 affect?

CVE-2026-33396 affects oneuptime. Severity is critical (CVSS 9.9). OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.35, a low-privileged authenticated user (ProjectMember) can achieve remote command execution on the Probe container/host by abusing Synthetic Monitor P

Q: How urgent is CVE-2026-33396?

Priority 54/100. Critical severity; Public exploit reference

This month

CRITICAL 9.9UPGRADE

CVE-2026-33396 is a critical-severity flaw (CVSS 9.9) affecting oneuptime. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.35, a low-privileged authenticated user (ProjectMember) can achieve remote command execution on the Probe container/host by abusing Synthetic Monitor Playwright script execution. Synthetic monitor code is executed in VMRunner.runCodeInNodeVM with a live Playwright page object in context. The sandbox relies on a denylist of blocked properties/methods, but it i

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-78, CWE-184, CWE-693
Published	2026-03-26
Last modified	2026-10-07

Publisher (CNA): GitHub, Inc. · Vendor: hackerbay

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 14:16 UTCPublished CVE record published
2026-10-07 08:10 UTCUpdated Record last modified

hackerbay oneuptime UPGRADE

Affected: < 10.0.35

Fixed in: 10.0.35

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy oneuptime || rpm -q oneuptime || oneuptime --version

2. UPGRADE to 10.0.35 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade oneuptime

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oneuptime

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · fonttools · FIXED · 4.68.0-1.eln159 · FEDORA-2026-37fa4b964c · source

sudo dnf upgrade --advisory=FEDORA-2026-37fa4b964c

Fedora 46 · fonttools · FIXED · 4.68.0-1.fc46 · FEDORA-2026-65d6c01c75 · source

sudo dnf upgrade --advisory=FEDORA-2026-65d6c01c75

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjg

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33396?

oneuptime: upgrade to 10.0.35. Exact commands for each OS are on this page.

Is CVE-2026-33396 being exploited?

CVE-2026-33396 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33396 affect?

CVE-2026-33396 affects oneuptime. Severity is critical (CVSS 9.9). OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.35, a low-privileged authenticated user (ProjectMember) can achieve remote command execution on the Probe container/host by abusing Synthetic Monitor P

How urgent is CVE-2026-33396?

Priority 54/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-35053 CRITICAL 9.8 UPGRADE OneUptime is an open-source monitoring and observability platform
CVE-2026-34759 HIGH 8.1 UPGRADE OneUptime is an open-source monitoring and observability platform
CVE-2026-34758 CRITICAL 9.1 UPGRADE OneUptime is an open-source monitoring and observability platform
CVE-2026-34840 HIGH 8.1 UPGRADE OneUptime is an open-source monitoring and observability platform

References

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