CVE-2026-56227

Description

Capgo before 12.128.2 contains a server-side request forgery vulnerability in webhook URL validation that allows loopback and internal addresses. Organization admins can configure webhooks pointing to localhost or 127.0.0.1, and when triggered, the backend performs outbound requests to these addresses with error responses disclosed to users.

CVSS Vector

References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f
• https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation