PT-2026-51406 · Cap Go · Cap-Go

Judel777 · Published 2026-06-22 · Updated 2026-06-22 · CVE-2026-56280

NVD

CVSS v3.1

7.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

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.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-56280

Affected Products

Cap-Go

References · 3

• https://github.com/Cap-go/capgo/security/advisories/GHSA-95g7-xwwx-j737 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56280 · Security Note
• https://vulncheck.com/advisories/cap-go-privilege-inversion-in-build-log-stream-via-sse-disconnect · Note