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CVE-2026-118425— Keycloak-services: keycloak-services: redirect uri domain allowlist bypass via dns resolution to loopback

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（一种身份与访问管理解决方案）的 客户端策略中发现了漏洞。当该策略被配置为允许回环地址时，Keycloak 在验证过程中会通过 DNS 解析主机名。攻击者可以利用解析到回环地址的主机名，绕过域名白名单限制，从而可能注册未经授权的重定向 URI。

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-118425

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: redirect uri domain allowlist bypass via dns resolution to loopback
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the secure-redirect-uris-enforcer client policy of Keycloak, an identity and access management solution. The issue occurs when the policy is configured to allow loopback addresses, as Keycloak resolves hostnames via DNS during validation. An attacker can bypass domain allowlist restrictions by using a hostname that resolves to a loopback address, potentially allowing the registration of unauthorized redirect URIs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
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-2026-118425

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III. Intelligence Information for CVE-2026-118425

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Other References for CVE-2026-118425 (1)

Same Patch Batch · Red Hat · 2026-10-29 · 16 CVEs total

CVE-2026-114488 7.4 HIGH Wildfly: wildfly-iiop: wildfly-ejb3: wildfly: authentication bypass on iiop ejb invocation
CVE-2026-15564 7.4 HIGH Wildfly-ejb: wildfly-iiop-openjdk: eap iiop listeners may permit unauthed deserialization
CVE-2026-93006 6.8 MEDIUM Dnsmasq: dnsmasq: tftp prefetch cache keyed on stale heap pointer serves wrong file conten
CVE-2026-93008 6.8 MEDIUM Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns config
CVE-2026-117548 6.5 MEDIUM 389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schem
CVE-2026-19610 6.5 MEDIUM Wildfly-platform-mbean: wildfly-platform-mbean: rbac sensitive attribute read bypass for p
CVE-2026-117859 5.4 MEDIUM Keycloak-services: keycloak-services: par single-use bypass via flow restart
CVE-2026-117627 5.4 MEDIUM Keycloak-services: keycloak-services: jwt authorization grant bypasses identity provider l
CVE-2026-93007 5.3 MEDIUM Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation
CVE-2026-93011 5.3 MEDIUM Dnsmasq: dnsmasq: heap out-of-bounds write in dnssec validator via to_wire/from_wire trans
CVE-2026-117688 5.3 MEDIUM Keycloak-services: keycloak-services: vault secret disclosure via client registration inst
CVE-2026-93009 4.3 MEDIUM Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoder
CVE-2026-93010 4.3 MEDIUM Dnsmasq: dnsmasq: --leasequery without address argument applies no source address check
CVE-2026-118030 4.2 MEDIUM Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse acr
CVE-2026-85498 3.5 LOW Polkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-601