CVE-2026-56252 | THREATINT

Description

Capgo before 12.128.2 contains a scope isolation vulnerability in the POST /webhooks/test endpoint that allows app-scoped API keys to invoke org-scoped webhook operations. Attackers with app-scoped credentials can trigger signed outbound webhook deliveries for arbitrary organization webhooks outside their declared app boundary, bypassing the limited_to_apps authorization check.

PUBLISHED Reserved 2026-06-19 | Published 2026-07-12 | Updated 2026-07-13 | Assigner VulnCheck

MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem types

Incorrect Authorization

Product status

Default status

unaffected

Any version before 12.128.2

affected

12.128.2 (semver)

unaffected

Credits

Judel777 reporter

References

github.com/.../capgo/security/advisories/GHSA-qvr7-f6j6-64wp exploit

github.com/.../capgo/security/advisories/GHSA-qvr7-f6j6-64wp (GitHub Security Advisory (GHSA-qvr7-f6j6-64wp)) vendor-advisory

www.vulncheck.com/...lation-failure-in-webhook-test-endpoint (VulnCheck Advisory: Capgo - Scope Isolation Failure in Webhook Test Endpoint) third-party-advisory

cve.org (CVE-2026-56252)

nvd.nist.gov (CVE-2026-56252)

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