What is CVE-2026-34758?

CVE-2026-34758 is a critical-severity vulnerability in 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 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…

Vulnerability class: Broken Authentication

EPSS: 0.001 (18.3th 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

Oneuptime — versions < 10.0.42

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-q253-6wcm-h8hp (x_refsource_CONFIRM)
https://github.com/OneUptime/oneuptime/commit/9adbd04538714740506708d6fa610e433be4d2a4 (x_refsource_MISC)
https://github.com/OneUptime/oneuptime/releases/tag/10.0.42 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34758?: CVE-2026-34758 is a critical-severity vulnerability in 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.