CVE-2026-30956: OneUptime is a solution for monitoring and managing online services

Q: How do I fix CVE-2026-30956?

oneuptime: upgrade to 10.0.21. Exact commands for each OS are on this page.

Q: Is CVE-2026-30956 being exploited?

CVE-2026-30956 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-2026-30956 affect?

CVE-2026-30956 affects oneuptime. Severity is critical (CVSS 9.9). OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header to

Q: How urgent is CVE-2026-30956?

Priority 51/100. Critical severity; Public exploit reference

This month

CRITICAL 9.9UPGRADE

CVE-2026-30956 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 a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header together with a controlled projectid header. Because the server trusts this client-supplied header, internal permission checks in BasePermission are skipped and tenant scoping is disabled. This allows attackers t

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	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-285, CWE-862
Published	2026-03-10
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

2026-03-10 18:18 UTCPublished CVE record published
2026-10-07 08:10 UTCUpdated Record last modified

hackerbay oneuptime UPGRADE

Affected: < 10.0.21

Fixed in: 10.0.21

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.0.21 (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.

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-2026-30956?

oneuptime: upgrade to 10.0.21. Exact commands for each OS are on this page.

Is CVE-2026-30956 being exploited?

CVE-2026-30956 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-2026-30956 affect?

CVE-2026-30956 affects oneuptime. Severity is critical (CVSS 9.9). OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header to

How urgent is CVE-2026-30956?

Priority 51/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-30957 CRITICAL 9.9 UPGRADE OneUptime is a solution for monitoring and managing online services
CVE-2026-33396 CRITICAL 9.9 UPGRADE OneUptime is an open-source monitoring and observability platform
CVE-2026-32306 CRITICAL 9.9 UPGRADE OneUptime is a solution for monitoring and managing online services
CVE-2026-30958 HIGH 7.2 UPGRADE OneUptime is a solution for monitoring and managing online services
CVE-2026-33143 HIGH 7.5 UPGRADE OneUptime is a solution for monitoring and managing online services

References

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