Auth bypass in Hackerbay Oneuptime
CVE-2026-35053
OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, the Worker service's ManualAPI exposes workflow execution endpoints (GET /workflow/manual/run/:workflowId and POST /workflow/manual/run/:workflowId) without any authentication middleware. An attacker who can obtain or guess a workflow ID can trigger arbitrary workflow execution with attacker-controlled input data, enabling JavaScript code execution, notification abuse, and data manipulation. This issue has been patched in version 10.0.42.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Hackerbay Oneuptime
- Oneuptime — versions < 10.0.42
Weakness classification (CWE)
References
- github.com/OneUptime/oneuptime/security/advisories/GHSA-6c3w-7xg4-4cf7 (Exploit, Vendor Advisory)
- github.com/OneUptime/oneuptime/releases/tag/10.0.42 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-35053?
- CVE-2026-35053 is a critical-severity vulnerability in Hackerbay Oneuptime, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-04-02.
- How severe is CVE-2026-35053?
- Critical severity. CVSS v3 base score is 9.8 out of 10.