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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-gjjc-pcwp-c74m OneUptime has WebAuthn 2FA bypass: server accepts client-supplied challenge instead of server-stored value, allowing credential replay
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 10 Mar 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Hackerbay
Hackerbay oneuptime
CPEs cpe:2.3:a:hackerbay:oneuptime:*:*:*:*:*:*:*:*
Vendors & Products Hackerbay
Hackerbay oneuptime

Mon, 09 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Oneuptime
Oneuptime oneuptime
Vendors & Products Oneuptime
Oneuptime oneuptime

Fri, 06 Mar 2026 05:15:00 +0000

Type Values Removed Values Added
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.
Title OneUptime has WebAuthn 2FA bypass: server accepts client-supplied challenge instead of server-stored value, allowing credential replay
Weaknesses CWE-287
CWE-294
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-09T19:46:22.314Z

Reserved: 2026-03-03T14:25:19.244Z

Link: CVE-2026-28787

cve-icon Vulnrichment

Updated: 2026-03-09T19:46:18.758Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-06T05:16:39.980

Modified: 2026-03-10T19:51:16.083

Link: CVE-2026-28787

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-06T14:55:41Z

Weaknesses