CVE-2026-56223 · Symaro Security Advisory

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.

Severity (CVSS)

Base score	9.3
Severity	Critical
Version	CVSS 4.0
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
Provided by	CNA

Weaknesses

CWE-287 — Improper Authentication

Affected products

Vendor	Product	Versions
Capgo	Capgo	0 to <12.128.2; 12.128.2

References

https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg (vendor-advisory)
https://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user (third-party-advisory)

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 25 Jun 2026 10:14 UTC.