🛡️ CVE-2026-28787
🟠 CVSS 8.2 — High ✅ No Known Exploit CWE-287 NVD
8.2
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 8.2
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE CWE-287
Public Exploit ✅ No
Source NVD
Published 2026-03-02
Updated 2026-06-02
Modified 2026-03-06
Fix URL N/A

Affected Packages

Software From version Fixed in
@oneuptime/common — —
oneuptime — 10.0.11

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