Capgo – Account Takeover via Cross-Domain SSO Email Assertion in provision-user_CVE-2026-56223

{
    "lastseen": "",
    "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.",
    "published": "2026-06-24T11:53:08.057Z",
    "modified": "2026-06-24T11:53:08.057Z",
    "type": "cve",
    "title": "Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user",
    "source": "VulnCheck",
    "references": "https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg\nhttps://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user",
    "id": "CVE-2026-56223",
    "bulletinFamily": "",
    "cwe": [
        "CWE-287"
    ],
    "cvelist": null,
    "sourceData": "Capgo Capgo 0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Capgo",
    "version": "0",
    "vendor": "Capgo",
    "ai_description": "Cross-domain SSO account takeover vulnerability via email assertion in provision-user endpoint",
    "ai_severity": "Critical",
    "ai_vendor": "Capgo",
    "ai_product": "Capgo",
    "ai_version": "before 12.128.2",
    "ai_score": 9.3
}