CVE-2026-34758: Hackerbay Oneuptime

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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

• Hackerbay Oneuptime: before 10.0.40 (fixed in 10.0.40)

Published 2026-04-02. Last modified 2026-10-06.