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CVE-2026-4325— Keycloak: keycloak: replay of action tokens via improper handling of single-use entries

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.2
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开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于SingleUseObjectProvider缺乏适当的类型和命名空间隔离，可能导致攻击者删除任意单次使用条目，从而重放已使用的操作令牌，造成未经授权的访问或账户泄露。

CVSS 5.3 · Medium EPSS 0.41% · P33
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I. Basic Information for CVE-2026-4325

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: replay of action tokens via improper handling of single-use entries
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an attacker to delete arbitrary single-use entries, which can enable the replay of consumed action tokens, such as password reset links. This could lead to unauthorized access or account compromise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的划分
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于SingleUseObjectProvider缺乏适当的类型和命名空间隔离，可能导致攻击者删除任意单次使用条目，从而重放已使用的操作令牌，造成未经授权的访问或账户泄露。
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 26.2 26.2.15-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-18 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-18 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2.15 - cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.11-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.11 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-4325

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III. Intelligence Information for CVE-2026-4325

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Vendor Advisories for CVE-2026-4325 (6)

Same Patch Batch · Red Hat · 2026-04-02 · 5 CVEs total

CVE-2026-4636 8.1 HIGH Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized acce
CVE-2026-4634 7.5 HIGH Keycloak: keycloak: denial of service via excessive processing of openid connect scope par
CVE-2026-4282 7.4 HIGH Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseob
CVE-2026-3872 7.3 HIGH Keycloak: keycloak: information disclosure due to redirect_uri validation bypass

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.2
Same vendor: Red Hat
Same weakness: CWE-653

V. Comments for CVE-2026-4325

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