Vulnerability DatabaseCVE-2026-56227
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CVE-2026-56227
Published:June 20, 2026
Updated:June 29, 2026
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.
Affected Packages
https://github.com/Cap-go/capgo.git (GITHUB):
Affected version(s) >=capgo-12.123.9 <capgo-12.128.2
Fix Suggestion:
Update to version capgo-12.128.2
Related Resources (2)
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
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CVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
LOW
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Server-Side Request Forgery (SSRF)
CWE-918
EPSS
Base Score:
0.16