What is CVE-2026-34758?

CVE-2026-34758 is a critical-severity vulnerability in Hackerbay Oneuptime, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-04-02.

How severe is CVE-2026-34758?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Hackerbay Oneuptime

CVE-2026-34758

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.

Vulnerability class: Broken Authentication

EPSS: 0.003 (27.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Hackerbay Oneuptime
Oneuptime — versions < 10.0.42

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-34758?: CVE-2026-34758 is a critical-severity vulnerability in Hackerbay Oneuptime, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-04-02.
How severe is CVE-2026-34758?: Critical severity. CVSS v3 base score is 9.1 out of 10.