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CVE-2026-9793— Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在数据伪造问题漏洞，该漏洞源于当提交JSON Web加密加密请求对象时，如果解密内容是原始JSON，Keycloak可能错误处理未签名声明，绕过配置的签名策略，可能导致远程攻击者提交未经授权的声明，从而破坏OpenID Connect授权流程中的数据完整性。

CVSS 5.9 · Medium EPSS 0.26% · P16

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.4 26.4.14-1< * unaffected
26.4-22< * unaffected
26.4-22< * unaffected
Red Hat Red Hat build of Keycloak 26.4.14 any unaffected
Red Hat Red Hat build of Keycloak 26.6 26.6.5-1< * unaffected
26.6-11< * unaffected
26.6-11< * unaffected
Red Hat Red Hat build of Keycloak 26.6.5 any unaffected
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I. Basic Information for CVE-2026-9793

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在数据伪造问题漏洞，该漏洞源于当提交JSON Web加密加密请求对象时，如果解密内容是原始JSON，Keycloak可能错误处理未签名声明，绕过配置的签名策略，可能导致远程攻击者提交未经授权的声明，从而破坏OpenID Connect授权流程中的数据完整性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.4 26.4.14-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-22 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-22 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.14 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.6 26.6.5-1 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-11 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-11 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.5 - cpe:/a:redhat:build_keycloak:26.6::el9

II. Public POCs for CVE-2026-9793

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III. Intelligence Information for CVE-2026-9793

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Vendor Advisories for CVE-2026-9793 (5)

Other References for CVE-2026-9793 (1)

Same Patch Batch · Red Hat · 2026-05-28 · 14 CVEs total

CVE-2026-4408 9.0 CRITICAL Samba: remote code execution in samr
CVE-2026-9804 7.7 HIGH Kubevirt: kubevirt: vmexport directory symlink escape enables exporter pod file read
CVE-2026-9795 7.3 HIGH Keycloak: keycloak: privilege escalation via improper scope mapping enforcement
CVE-2026-44604 7.0 HIGH Rpm: command injection in rpmuncompress dountar() via unescaped archive top-level director
CVE-2026-9802 6.8 MEDIUM Keycloak: keycloak: unauthorized account access via replayed refresh tokens after cluster
CVE-2026-9792 6.5 MEDIUM Keycloak: keycloak: security restriction bypass allows unauthorized ropc token acquisition
CVE-2026-9796 6.5 MEDIUM Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnera
CVE-2026-9794 5.3 MEDIUM Keycloak: keycloak: information disclosure via saml ecp endpoint
CVE-2026-9803 5.3 MEDIUM Keycloak: keycloak: denial of service via malformed authorization header
CVE-2026-9801 4.9 MEDIUM Keycloak: keycloak: denial of service via malformed ldap password policy response
CVE-2026-9791 4.3 MEDIUM Keycloak-rhel9: organization data leak after feature disabled in keycloak
CVE-2026-9798 4.3 MEDIUM Keycloak: keycloak: brute-force protection bypass in ciba flow
CVE-2026-10028 4.3 MEDIUM Glib-networking: infinite loop in glib-networking gnutls backend allows remote denial of s

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-347

V. Comments for CVE-2026-9793

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