CVE-2026-34758: OneUptime is an open-source monitoring and observability platform

Q: How do I fix CVE-2026-34758?

oneuptime: upgrade to 10.0.40. Exact commands for each OS are on this page.

Q: Is CVE-2026-34758 being exploited?

CVE-2026-34758 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-2026-34758 affect?

CVE-2026-34758 affects oneuptime. Severity is critical (CVSS 9.1). OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, unauthenticated access to Notification test and Phone Number management endpoints allows SMS/Call/Email/WhatsApp abuse and phone number purchase. T

Q: How urgent is CVE-2026-34758?

Priority 49/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-34758 is a critical-severity flaw (CVSS 9.1) 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 10.0.42, unauthenticated access to Notification test and Phone Number management endpoints allows SMS/Call/Email/WhatsApp abuse and phone number purchase. This issue has been patched in version 10.0.42.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-04-02
Last modified	2026-10-06

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

Last updated 2026-10-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 19:21 UTCPublished CVE record published
2026-10-06 22:10 UTCUpdated Record last modified

hackerbay oneuptime UPGRADE

Affected: < 10.0.40

Fixed in: 10.0.40

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.0.40 (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-2026-34758?

oneuptime: upgrade to 10.0.40. Exact commands for each OS are on this page.

Is CVE-2026-34758 being exploited?

CVE-2026-34758 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-2026-34758 affect?

CVE-2026-34758 affects oneuptime. Severity is critical (CVSS 9.1). OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, unauthenticated access to Notification test and Phone Number management endpoints allows SMS/Call/Email/WhatsApp abuse and phone number purchase. T

How urgent is CVE-2026-34758?

Priority 49/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WhatsApp vulnerabilities

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References

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