CVE-2026-9793
5.9 MEDIUMA flaw was found in Keycloak
Published: 2026-05-28 · Last updated: 2026-06-03
Severity and scoring
- CVSS
- 5.9 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CWE
- CWE-347
Affected products
| Vendor | Product |
|---|---|
| redhat | build_of_keycloak |
Description
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-9793
- [Vendor advisory]https://access.redhat.com/security/cve/CVE-2026-9793
- [Vendor advisory]https://bugzilla.redhat.com/show_bug.cgi?id=2482460
Related CVEs
Same vendor
- CVE-2026-11793 — A stack buffer overflow flaw was found in 389 Directory Server (4.9 MEDIUM)
- CVE-2026-11790 — A flaw was found in 389 Directory Server (4.9 MEDIUM)
- CVE-2026-11789 — A flaw was found in 389 Directory Server (4.9 MEDIUM)
- CVE-2026-11788 — A flaw was found in 389 Directory Server (5.9 MEDIUM)
- CVE-2026-11787 — A flaw was found in 389 Directory Server (5.0 MEDIUM)
Same CWE
- CVE-2026-42743 — Unauthenticated Broken Authentication in Masteriyo - LMS <= 2.1.8 versions (6.5 MEDIUM)
- CVE-2026-48558 — SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authenticati... (10.0 CRITICAL)
- CVE-2026-50010 — Netty is a network application framework for development of protocol servers and clients (7.5 HIGH)
- CVE-2026-50634 — A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadata that was not authenticate... (6.5 MEDIUM)
- CVE-2026-41005 — Cloud Foundry UAA incorrectly treated XML encryption to the Service Provider (confidentiality) as a substitute for XML signatures from th... (9.0 CRITICAL)