CVE-2026-28787
CVE-2026-28787 · OneUptime has WebAuthn 2FA bypass: server accepts client-supplied challenge instead of server-stored value, allowing credential replay
This page contains facts from public vulnerability sources. Check the original advisory before updating.
OneUptime is a solution for monitoring and managing online services. In version 10.0.11 and prior, the WebAuthn authentication implementation does not store the challenge on the server side. Instead, the challenge is returned to the client and accepted back from the client request body during verification. This violates the WebAuthn specification (W3C Web Authentication Level 2, §13.4.3) and allows an attacker who has obtained a valid WebAuthn assertion (e.g., via XSS, MitM, or log exposure) to replay it indefinitely, completely bypassing the second-factor authentication. No known patches are available.
CVSS 8.2 · High · EPSS 0.3%
- Published
- Updated
Stack: node
Affected products and versions
oneuptime
- Versions
- <= 10.0.11: Affected
No fix published
@oneuptime/common npm
- Affected ranges
- SEMVER: ≤ 10.0.11
No fix published