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CVE-2026-15943— Keycloak-services: keycloak-services: oidc idp update reuses masked client secret after token url change

CVSS 5.5 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1AI

T1556 · Modify Authentication Process

Affected Version Matrix 6

VendorProductVersion RangeStatus
Red HatRed Hat Build of Keycloakanyaffected
anyaffected
anyaffected
Red HatRed Hat Data Grid 8anyunaffected
Red HatRed Hat JBoss Enterprise Application Platform Expansion Packanyunaffected
Red HatRed Hat Single Sign-On 7anyunaffected
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I. Basic Information for CVE-2026-15943

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: oidc idp update reuses masked client secret after token url change
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1288
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一种身份和访问管理解决方案。 keycloak存在输入验证错误漏洞，该漏洞源于keycloak-services组件处理身份提供者管理时输入验证不当，当委托管理员使用掩码的客户端秘密标记值更新OIDC身份提供者时，即使令牌URL等安全敏感字段已被更改，Keycloak仍重用现有的真实秘密，允许攻击者重定向并捕获该秘密。
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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Data Grid 8-cpe:/a:redhat:jboss_data_grid:8
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat Single Sign-On 7-cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-15943

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III. Intelligence Information for CVE-2026-15943

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Vendor Advisories for CVE-2026-15943 (2)

Same Patch Batch · Red Hat · 2026-07-17 · 8 CVEs total

CVE-2026-160935.4 MEDIUMKeycloak-services: keycloak-services: required signed-jwt assertion policy can be bypassed
CVE-2026-160895.4 MEDIUMKeycloak-services: keycloak-services: authorization codes can be retargeted to another cli
CVE-2026-161064.9 MEDIUMKeycloak-services: keycloak-services: incorrect authorization in admin role-composite dele
CVE-2026-160724.9 MEDIUMKeycloak-services: keycloak-services: organization invitation link exposure allows unautho
CVE-2026-161044.3 MEDIUMKeycloak-services: keycloak-services: authenticator config endpoint exposes raw recaptcha
CVE-2026-161034.3 MEDIUMKeycloak-services: keycloak-services: incomplete fix for ciba brute-force lockout bypass a
CVE-2026-161084.3 MEDIUMKeycloak-services: keycloak-services: realm default-group reads disclose hidden groups und

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-1288

V. Comments for CVE-2026-15943

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