CVE-2026-56223 Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user
Attackers can take over victim accounts by forging SAML assertions in the provision-user endpoint due to missing domain validation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56223?
CVE-2026-56223 is a critical authentication bypass vulnerability in Capgo, published on 24 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-56223?
How do I fix CVE-2026-56223?
No fix has been published for CVE-2026-56223 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-56223 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56223 exists.
Sources
Also known as GHSA-jhjh-vp9p-54fg.