CVE-2026-56223

Summary

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.

Affected Software

Weaknesses

• CWE-287: Improper Authentication

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg

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

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