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Vulnerability record · CVE-2026-56223 · published 24 June 2026

CVE-2026-56223: Improper authentication vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.40% · top 68.1% CWE-287 · Improper authentication Deferred
9.3CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-56223), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.