---
cve: "CVE-2026-56223"
severity: "CRITICAL"
cvss: 9.3
epss: "24%"
vendor: "Capgo"
kev: false
exploited: false
published: "2026-06-24 13:16:33"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T06:57:32+02:00"
---

# CVE-2026-56223

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 6685e5f11adef257bf3d085e481f4d8ebcec602e (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56223) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_