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CVE-2026-56223

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

CVSS 4.0 9.3 CRITICALCVSS 3.1 8.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-56223

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-56223

Published

Capgo

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Capgo",
                    "product": "Capgo",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/Cap-go/capgo",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "12.128.2"
                        },
                        {
                            "version": "12.128.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON