Auth bypass in Hackerbay Oneuptime
CVE-2026-34759
OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, multiple notification API endpoints are registered without authentication middleware, while sibling endpoints in the same codebase correctly use ClusterKeyAuthorization.isAuthorizedServiceMiddleware. These endpoints are externally reachable via the Nginx proxy at /notification/. Combined with a projectId leak from the public Status Page API, an unauthenticated attacker can purchase phone numbers on the victim's Twilio account and delete all existing alerting numbers. This issue has been patched in version 10.0.42.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
- Hackerbay Oneuptime
- Oneuptime — versions < 10.0.42
Weakness classification (CWE)
References
- github.com/OneUptime/oneuptime/security/advisories/GHSA-6wc5-rhvj-cx7f (Exploit, Mitigation, Vendor Advisory)
- github.com/OneUptime/oneuptime/commit/9adbd04538714740506708d6fa610e433be4d2a4 (Patch)
- github.com/OneUptime/oneuptime/releases/tag/10.0.42 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34759?
- CVE-2026-34759 is a high-severity vulnerability in Hackerbay Oneuptime, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-04-02.
- How severe is CVE-2026-34759?
- High severity. CVSS v3 base score is 8.1 out of 10.