Vulnerability · Published Jun 20, 2026 · Assigned by VulnCheck
CVE-2026-56227Capgo - Server-Side Request Forgery via Webhook URL Validation
Medium 5.4
In plain English
A medium-severity server-side request forgery in Capgo from Capgo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 82.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
References
- GHSA Advisory GHSA-48hc-53hv-6x3f vendor-advisory
- VulnCheck Advisory: Capgo - Server-Side Request Forgery via Webhook URL Validation third-party-advisory