---
cve: "CVE-2026-16442"
severity: "HIGH"
cvss: 7.4
epss: "20%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-08-05 15:00:39"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T00:57:27+02:00"
---

# CVE-2026-16442

> 7.4 HIGH

## Beschreibung

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <https://access.redhat.com/errata/RHSA-2026:50846>
- <https://access.redhat.com/errata/RHSA-2026:50847>
- <https://access.redhat.com/errata/RHSA-2026:50848>
- <https://access.redhat.com/errata/RHSA-2026:50849>
- <https://access.redhat.com/security/cve/CVE-2026-16442>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2503138>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-16442) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_