PT-2026-44184 · Red Hat · Keycloak

Osidb Bzimport · Published 2026-05-28 · Updated 2026-06-03 · CVE-2026-9793

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Keycloak (affected versions not specified)

Description A flaw exists where Keycloak may incorrectly process unsigned claims when a JSON Web Encryption (JWE) encrypted request object is submitted, provided the decrypted content is raw JSON. This behavior bypasses the configured signature policy, allowing a remote attacker to submit unauthorized claims and compromising data integrity within the OpenID Connect (OIDC) authorization flow. This issue violates OIDC Core and Financial-grade API (FAPI) signing requirements, although a redirect URI allowlist serves as a compensating control.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-9793

GHSA-P3V8-FM5P-V84H

Affected Products

Keycloak

References · 8

• https://bugzilla.redhat.com/show_bug.cgi?id=2482460 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-p3v8-fm5p-v84h · Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2026-9793 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-9793 · Security Note
• https://github.com/keycloak/keycloak/issues/49429 · Note
• https://github.com/keycloak/keycloak · Note
• https://t.me/cveNotify/165839 · Telegram Post
• https://twitter.com/TheRabbitPy/status/2059892618952167744 · Twitter Post