CVE-2026-56280: Cap-Go Capgo

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Cap-Go Capgo: before 12.128.2 (fixed in 12.128.2)

Published 2026-06-22. Last modified 2026-06-24.