by Kastro
Paper/Archive/CVE-2026-56223

CVE-2026-56223

Capgo Capgo — Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user

EPSS 0.4%public exploitCVSS 9.3
critical.is priorityof 100
45
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 34.5.345 × 206.9Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Capgo< 12.128.212.128.2CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
VulnCheck (CNA)8.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: partial

References

exploitgithub.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fgwriteupvulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user