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CVE-2026-118030— Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse across concurrent logins

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.

在提供身份和访问管理服务的 keycloak-services 组件中，发现其 HOTP（基于时间的一次性密码）认证机制存在缺陷。该问题源于系统在两个独立的步骤中分别验证一次性密码并更新内部计数器，且未实施适当的锁机制。攻击者若已知用户密码，可利用此时间差，使同一个一次性密码被多次同时用于登录。

CVSS 4.2 · Medium

Possible ATT&CK Techniques 1 AI

T1110.001 · Password Guessing
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I. Basic Information for CVE-2026-118030

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse across concurrent logins
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the HOTP authentication mechanism of the keycloak-services component, which provides identity and access management services. The issue occurs because the system validates a one-time password and updates its internal counter in two separate steps without proper locking. An attacker with a users password could exploit this timing gap to use a single one-time code to log in multiple times simultaneously.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
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-2026-118030

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III. Intelligence Information for CVE-2026-118030

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Other References for CVE-2026-118030 (2)

Same Patch Batch · Red Hat · 2026-10-29 · 9 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-2026-117548 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-2026-117688 5.3 MEDIUM Keycloak-services: keycloak-services: vault secret disclosure via client registration inst
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-362