CVE-2026-56227

Medium

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.

SeverityMedium

CVSS5.4

Exploit probability—

ProductCapgo

PublishedJun 20, 2026

First seenJun 20, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

Capgo Capgo12.128.2 or later

Vendor advisories

github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f

Affected products

Product	Affected versions	Fixed in
Capgo Capgo	v < 12.128.2	12.128.2

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