What’s Vulnerable › Vulnerabilities

CVE-2026-34758: OneUptime: Missing Authentication on Notification Endpoints

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-02 · updated 2026-10-06
• Weakness: CWE-306

Description

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.

Affected products

• oneuptime: before 10.0.40 — fixed in 10.0.40

How to fix

Upgrade to a fixed version: oneuptime 10.0.40. Check the vendor advisory for mitigations.

References

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

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