CVE-2026-56223

Description

Capgo before 12.128.2 contains a cross-domain SSO account takeover vulnerability in the provision-user endpoint that allows attackers to merge arbitrary victim accounts based on email match without validating SSO provider domain authorization. An attacker with enterprise org admin access and a malicious IdP can forge SAML assertions containing victim email addresses to trigger account merge and gain full access to victim accounts, organizations, and data.

CVSS Vector

References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg
• https://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user
• https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg