MEDIUMVulnerability
CVE-2026-9793
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.
Properties
- severity
- MEDIUM
- score
- 5.9
- cve_id
- CVE-2026-9793
- vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- published_at
- 2026-05-28T05:16:40.697
- last_modified
- 2026-08-05T19:17:49.760
Related Entities (3)
HAS_WEAKNESS (1)
→[Weakness]Improper Verification of Cryptographic Signature
DESCRIBED_BY (1)
→[Source]NVD
AFFECTS_PRODUCT (1)
→[Product]
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