Is CVE-2026-28787 actively exploited?

CVE-2026-28787 has no public evidence of in-the-wild exploitation as of 2026-03-06.

What is the CVSS score for CVE-2026-28787?

CVE-2026-28787 has a CVSS score of 8.2 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.

How do I patch CVE-2026-28787?

Vendor patch guidance is linked from the references on this page. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-28787.

Which products are affected by CVE-2026-28787?

Affected products for CVE-2026-28787 are listed on this page once vendor data becomes available.

Fix CVE-2026-28787 - HIGH Vulnerability

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 Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Attack Vector: network
Complexity: high
Privileges: low
User Action: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: none
Weaknesses: CWE-287 · Improper Authentication CWE-294

Metadata

Primary Vendor: UNKNOWN
Published: 3/6/2026
Last Modified: 3/6/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

No affected products information available.

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-28787. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-28787

View on NIST NVD

CVE-2026-28787 vulnerability