MEDIUMCVSS 5.9Vulnerability
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
- cvss_severity
- MEDIUM
- cvss_score
- 5.9
- epss_score
- 0.00256
- retrieved_at
- 2026-09-25T11:11:37+00:00
- last_source
- FIRST EPSS
- score
- 5.9
- cve_id
- CVE-2026-9793
- cvss_vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- signal_observed_at
- 2026-09-11T17:55:57+00:00
- 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
- 2026-08-20T01:16:54.610
- epss_percentile
- 0.15399
Related Entities (4)
ENRICHED_BY (1)
→[Source]FIRST EPSS
HAS_WEAKNESS (1)
→[Weakness]Improper Verification of Cryptographic Signature
DESCRIBED_BY (1)
→[Source]NVD
AFFECTS_PRODUCT (1)
→[Product]
Explore deeper with Ninja Signal's threat intelligence graph