CVE-2026-9793
Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
4th
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.
| CWE | CWE-347 |
| Vendor | red hat |
| Product | red hat build of keycloak |
| Published | May 28, 2026 |
| Last Updated | May 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat Build of Keycloak
All versions affected References
Credits
Red Hat would like to thank Sree Gopinath (sreelim) for reporting this issue.