SSRF in Capgo
CVE-2026-56227
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f (vendor-advisory)
- www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56227?
- CVE-2026-56227 is a medium-severity vulnerability in Capgo, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2026-06-20.
- How severe is CVE-2026-56227?
- Medium severity. CVSS v3 base score is 5.4 out of 10.