CVE-2026-56227
MEDIUMCapgo - Server-Side Request Forgery via Webhook URL Validation
Title source: cnaDescription
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 (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GHSA Advisory GHSA-48hc-53hv-6x3f
https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f
Third Party Advisory third-party-advisory
VulnCheck Advisory: Capgo - Server-Side Request Forgery via Webhook URL Validation
https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation
Scores
CVSS v3
5.4
EPSS
0.0016
EPSS Percentile
5.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-918
Status
published
Products (2)
Capgo/Capgo
< 12.128.2
Capgo/Capgo
12.128.2
Published
Jun 20, 2026
Tracked Since
Jun 20, 2026