CVE-2026-56227
MEDIUM EPSS 5.1%
Published Jun 20, 20261w ago · Modified Jun 22, 20261w ago
5.3 CVSS 4.0
Published Jun 20, 2026 1w ago
Last Modified Jun 22, 2026 1w ago
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 Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
5.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-918 Server-Side Request Forgery (SSRF) Validation
References 2
- github.com https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f
- vulncheck.com https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.