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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是Keycloak组织开源的一款身份认证与权限管理平台。 Keycloak存在授权问题漏洞，该漏洞源于设备授权授予流程中的令牌兑换过程未检查用户账户是否因暴力破解保护而被锁定，可能导致拥有锁定账户活动会话的攻击者完成设备登录并获取新的安全令牌，从而维持对账户的访问。

CVSS 6.5 · Medium EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat Build of Keycloak any affected
any affected
any affected
Red Hat Red Hat Single Sign-On 7 any affected
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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
Vulnerability Title
Keycloak 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一款身份认证与权限管理平台。 Keycloak存在授权问题漏洞，该漏洞源于设备授权授予流程中的令牌兑换过程未检查用户账户是否因暴力破解保护而被锁定，可能导致拥有锁定账户活动会话的攻击者完成设备登录并获取新的安全令牌，从而维持对账户的访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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 (2)

Same Patch Batch · Red Hat · 2026-09-10 · 6 CVEs total

CVE-2026-84042 7.8 HIGH Crun: crun: rootful krun with passt executes container payload as host root
CVE-2026-84828 6.5 MEDIUM Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token
CVE-2026-88859 6.3 MEDIUM Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-
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

IV. Related Vulnerabilities

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