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CVE-2026-28787
ANC
Critical

OneUptime is a solution for monitoring and managing online services. In version 10.0.11 and prior, the WebAuthn authentication implementati…

CVSS
9.0
Critical
EPSS
0.00
p19
Published
2026-01-01
Updated
2026-01-01
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.

Tags · CWE
Pre-auth
CWE-287
CAPEC-22
CAPEC-57
CAPEC-94
CAPEC-114
CAPEC-115
CAPEC-151
CAPEC-194
CAPEC-593
CAPEC-633
CAPEC-650
Affected products
Oneuptime ≤ 10.0.11
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Timeline
2026-01-01
Published
2026-01-01
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: H
High (H)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: C
Changed (C)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.003 · p19
Known exploited (KEV)
No
MITRE ATT&CK
Inferred via CAPEC
└ via CAPEC-57 · CWE-287
└ via CAPEC-633 · CWE-287
└ via CAPEC-593 · CWE-287
└ via CAPEC-650 · CWE-287
└ via CAPEC-114 · CWE-287
└ via CAPEC-593 · CWE-287
└ via CAPEC-94 · CWE-287
└ via CAPEC-593 · CWE-287
Known exploits — Сканер-ВС
No Сканер-ВС checks registered for this vulnerability yet.
Affected products
ProductVendorStatus
Tracked
oneuptime*Tracked