{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-56223: Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-56223","status":"final","version":"1","initial_release_date":"2026-06-24T11:53:08.057Z","current_release_date":"2026-06-24T13:46:06.984Z","revision_history":[{"date":"2026-06-24T11:53:08.057Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-56223 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-56223"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-56223"},{"category":"external","summary":"GitHub Security Advisory (GHSA-jhjh-vp9p-54fg)","url":"https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg"},{"category":"external","summary":"VulnCheck Advisory: Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user","url":"https://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user"}]},"product_tree":{"branches":[{"category":"vendor","name":"Capgo","branches":[{"category":"product_name","name":"Capgo","branches":[{"category":"product_version_range","name":"<12.128.2","product":{"name":"Capgo Capgo <12.128.2","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:capgo:capgo:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"12.128.2","product":{"name":"Capgo Capgo 12.128.2","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:capgo:capgo:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-56223","title":"Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"],"fixed":["CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":9.3,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 12.128.2.","product_ids":["CSAFPID-1"]}]}]}