---
cve: "CVE-2026-9793"
severity: "MEDIUM"
cvss: 5.9
epss: "16%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-05-28 03:44:17"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T11:01:23+02:00"
---

# CVE-2026-9793

> 5.9 MEDIUM

## Beschreibung

A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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 | Keine | good |
| 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-2026-9793>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2482460>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-9793) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_