CVE-2026-28787
High · 8.2CVSS
8.2
EPSS
0.4%
Published
Mar 6, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @oneuptime/common | 0 | No fix |
Related vulnerabilities
- GHSA-gjjc-pcwp-c74m OneUptime has WebAuthn 2FA bypass: server accepts client-supplied challenge instead of… Same vulnerability
- CVE-2026-30959 OneUptime is a solution for monitoring and managing online services. Also affects @oneuptime/common
- CVE-2026-30956 OneUptime is a solution for monitoring and managing online services. Also affects @oneuptime/common
- CVE-2026-30957 OneUptime is a solution for monitoring and managing online services. Also affects @oneuptime/common
- CVE-2026-30921 OneUptime is a solution for monitoring and managing online services. Also affects @oneuptime/common
- CVE-2026-30920 OneUptime is a solution for monitoring and managing online services. Also affects @oneuptime/common
- CVE-2026-30887 OneUptime is a solution for monitoring and managing online services. Also affects @oneuptime/common
- GHSA-cw6x-mw64-q6pv OneUptime has WhatsApp Resend Verification Authorization Bypass Also affects @oneuptime/common