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CVE-2026-105301— Keycloak-services: keycloak-services: blind ssrf via x.509 authenticator fetching attacker-controlled crl-dp/ocsp urls

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.

在 Keycloak 的 X.509 客户端证书身份验证器中发现了一个缺陷，Keycloak 是一款用于身份和访问管理解决方案。问题出现在服务器配置为使用 CRL 分发点或 OCSP 来检查证书吊销的情况。攻击者可以提供一个指向恶意服务器的特殊构造证书，导致 Keycloak 在证书完全验证之前向内部或外部端点发起未授权的出站请求。这可能导致盲服务器端请求伪造（SSRF）攻击。

CVSS 4.0 · Medium
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I. Basic Information for CVE-2026-105301

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: blind ssrf via x.509 authenticator fetching attacker-controlled crl-dp/ocsp urls
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the X.509 client-certificate authenticator of Keycloak, a solution for identity and access management. The issue occurs when the server is configured to check certificate revocation using CRL Distribution Points or OCSP. An attacker can provide a specially crafted certificate that points to a malicious server, causing Keycloak to make unauthorized outbound requests to internal or external endpoints before the certificate is fully validated. This can lead to a blind server-side request forgery (SSRF) attack.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
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-2026-105301

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III. Intelligence Information for CVE-2026-105301

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Other References for CVE-2026-105301 (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-2026-105302 5.7 MEDIUM Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-918

V. Comments for CVE-2026-105301

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