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CVE-2026-105302— Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access tokens

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
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 身份与访问管理解决方案的用户会话备注（User Session Note）映射器中发现了一个漏洞。该问题源于映射器未对请求的会话备注是否包含敏感的内部凭据（例如来自外部身份提供商的联合访问令牌）进行验证。这使得被授权的客户端管理员能够将用户的上游承载令牌泄露到其托管应用所获得的令牌中，从而可能导致未经授权访问用户在外部平台上的数据。

CVSS 5.7 · Medium
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I. Basic Information for CVE-2026-105302

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access tokens
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the User Session Note mapper of the Keycloak identity and access management solution. The issue occurs because the mapper does not validate whether a requested session note contains sensitive internal credentials, such as federated access tokens from external identity providers. This allows a delegated client administrator to leak a user's upstream bearer tokens into the tokens issued to their managed application, potentially leading to unauthorized access to the user's data on external platforms.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-105302

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III. Intelligence Information for CVE-2026-105302

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Other References for CVE-2026-105302 (2)

Same Patch Batch · Red Hat · 2026-10-05 · 3 CVEs total

CVE-2026-105306 6.5 MEDIUM Keycloak-services: keycloak-services: token introspection audience bypass via dynamic clie
CVE-2026-105301 4.0 MEDIUM Keycloak-services: keycloak-services: blind ssrf via x.509 authenticator fetching attacker

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-200

V. Comments for CVE-2026-105302

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