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CVE-2026-88770— Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-force-locked accounts

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（一种身份和访问管理解决方案）的设备授权授予（Device Authorization Grant）流程中存在一个缺陷。该问题源于令牌兑换过程未能检查用户账户是否因暴力破解保护机制而当前处于锁定状态。如果攻击者持有一个已被锁定的账户的有效会话，他们仍可完成设备登录流程并获取新的安全令牌。这使得攻击者能够在本应暂时禁用以阻止未授权访问的账户上维持访问权限。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-88770

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-force-locked accounts
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Device Authorization Grant flow of Keycloak, an identity and access management solution. The issue occurs because the token redemption process fails to check if a user account is currently locked due to brute-force protection. If an attacker has an active session for a locked account, they can complete the device login process and receive new security tokens. This allows the attacker to maintain access to the account even when it should be temporarily disabled to prevent unauthorized entry.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
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 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-2026-88770

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III. Intelligence Information for CVE-2026-88770

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Vendor Advisories for CVE-2026-88770 (1)

Other References for CVE-2026-88770 (1)

Same Patch Batch · Red Hat · 2026-09-10 · 5 CVEs total

CVE-2026-84042 7.8 HIGH Crun: crun: rootful krun with passt executes container payload as host root
CVE-2026-88763 5.9 MEDIUM Skupper-router: skupper-router: unbounded recursion in amqp field parser leads to denial o
CVE-2026-88265 5.6 MEDIUM Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and
CVE-2026-88264 5.6 MEDIUM Crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-307

V. Comments for CVE-2026-88770

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