CVE-2026-56280: high-severity vulnerability in Cap-go capgo
Cap-go - Privilege Inversion in Build Log Stream via SSE Disconnect
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.3%
Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect() using the privileged server-side BUILDER_API_KEY when clients disconnect, bypassing the app.build_native permission check required by the explicit POST /build/cancel/:jobId endpoint. Attackers with read-only API keys can repeatedly disrupt native build operations and CI/CD workflows by opening the log stream and dropping the connection.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
Cap-go · capgoRelated CVEs — Cap-go capgo
In the same product, most dangerous first.
CVE-2026-56081CRITICALCap-go - Account Lockout via 2FA Misconfiguration on Unverified EmailEPSS 0.4%CVE-2026-56248HIGHCapgo - Unauthenticated Denial-of-Service via audit_logs RLS PolicyEPSS 0.4%CVE-2026-56082HIGHCapgo - Unauthenticated Cross-Tenant Billing Log Tampering via public.record_build_time RPCEPSS 0.4%CVE-2026-56339HIGHCapgo - Unauthenticated Organization Existence Enumeration via rescind_invitation RPCEPSS 0.4%CVE-2026-56080MEDIUMCap-go - Authentication Logic Flaw in Enforce Password PolicyEPSS 0.4%CVE-2026-56235MEDIUMCapgo - Unauthenticated Cross-Tenant Metrics Disclosure via RPC FunctionsEPSS 0.3%