Oneuptime
CVE-2026-28787
HIGH
GHSA-gjjc-pcwp-c74m
Severity by source
AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 1 npm packages depend on @oneuptime/common (1 direct, 0 indirect)
Ecosystem-wide dependent count for version 10.0.11.
DescriptionGitHub Advisory
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.
AnalysisAI
OneUptime versions 10.0.11 and earlier contain an improper WebAuthn implementation where server-side challenge validation is missing, allowing attackers with a captured assertion to replay valid authentication tokens indefinitely and bypass multi-factor authentication. The vulnerability affects authenticated users and requires only low privileges to exploit, with public exploit code already available. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | OneUptime version 10.0.11 or prior with WebAuthn authentication enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.2 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all OneUptime deployments and document affected versions; restrict administrative access and monitor authentication logs for suspicious activity. …
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External POC / Exploit Code
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