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CVE-2026-90997— Keycloak: Replay protection bypass leads to unauthorized access via database driver semantics mismatch

Quick assessment

Affected
Keycloak 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 中发现了一个缺陷。当以无状态模式部署并搭配 MySQL 或 MariaDB 数据库时，由于数据库驱动与 Keycloak 应用逻辑在“行数”语义上存在不一致，攻击者可以绕过重放保护机制。该漏洞允许截获一次性安全工件（例如 JWT 客户端断言、DPoP 证明或一次性密码（TOTP）代码）的攻击者将其重放使用。成功利用此漏洞可使攻击者未经授权地访问令牌端点或登录流程。

CVSS 7.4 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Keycloak Keycloak 26.7.0< 26.7.4 affected
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I. Basic Information for CVE-2026-90997

Vulnerability Information
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Vulnerability Title
Keycloak: Replay protection bypass leads to unauthorized access via database driver semantics mismatch
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. When deployed in stateless mode with MySQL or MariaDB, a mismatch in row-count semantics between the database driver and Keycloak's application logic allows an attacker to bypass replay protection. This vulnerability enables an attacker who intercepts single-use security artifacts, such as JWT client assertions, DPoP proofs, or one-time password (TOTP) codes, to replay them. Successful exploitation grants unauthorized access to the token endpoint or login flow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Keycloak Keycloak 26.7.0 ~ 26.7.4 -

II. Public POCs for CVE-2026-90997

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III. Intelligence Information for CVE-2026-90997

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Other References for CVE-2026-90997 (1)

Other References for CVE-2026-90997 (1)

IV. Related Vulnerabilities

Same product: Keycloak
Same vendor: Keycloak
Same weakness: CWE-294

V. Comments for CVE-2026-90997

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