CVE-2026-30920
HIGH
GHSA-656w-6f6c-m9r6
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Lifecycle Timeline
4Description
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.19, OneUptime's GitHub App callback trusts attacker-controlled state and installation_id values and updates Project.gitHubAppInstallationId with isRoot: true without validating that the caller is authorized for the target project. This allows an attacker to overwrite another project's GitHub App installation binding. Related GitHub endpoints also lack effective authorization, so a valid installation ID can be used to enumerate repositories and create CodeRepository records in an arbitrary project. This vulnerability is fixed in 10.0.19.
Analysis
OneUptime versions prior to 10.0.19 allow unauthenticated attackers to hijack GitHub App integrations across projects by exploiting insufficient validation in the OAuth callback handler, enabling them to redirect repository access and create code records in arbitrary projects. Public exploit code exists for this vulnerability, and GitHub and OneUptime users remain at risk until patches are applied, as no fixes are currently available for the affected GitHub integration.
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Remediation
Within 24 hours: Identify all OneUptime instances and their GitHub App integrations; disable GitHub App functionality if non-critical, and isolate OneUptime from production systems. Within 7 days: Audit all GitHub App installation changes and review unauthorized access logs; rotate GitHub tokens and review commit history for suspicious activity. …
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External POC / Exploit Code
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