CVE-2026-28787

OneUptime CVE-2026-28787 affects versions 10.0.11 and earlier, where WebAuthn challenge data is not stored server-side. The server returns the generated challenge to the client and accepts the client-provided challenge during verification, violating WebAuthn and enabling replay of valid assertion...

CVE-2026-28787 OneUptime has WebAuthn 2FA bypass: server accepts client-supplied challenge instead of server-stored value, allowing credential replay

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...