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.

References

https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation

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

Details

Source: Mitre, NVD

Published: 2026-06-20

Updated: 2026-06-20

Risk Information

CVSS v2

Base Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

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

Severity: Medium

CVSS v4

Base Score: 5.3

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

Severity: Medium