CVE-2026-28787
CRITICAL EPSS 19.3%
Published Mar 6, 20263mo ago · Modified Mar 10, 20263mo ago
9.0 CVSS 3.1
Published Mar 6, 2026 3mo ago
Last Modified Mar 10, 2026 3mo ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
19.3% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 2
CWE-287 Improper Authentication Authentication
CWE-294
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| hackerbay | oneuptime | * | ≤10.0.11 |
References 1
- github.com https://github.com/OneUptime/oneuptime/security/advisories/GHSA-gjjc-pcwp-c74m
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.