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CVE-2026-3621— IBM WebSphere Application Server Liberty is affected by identity spoofing

Quick assessment

Affected
IBM WebSphere Application Server - Liberty
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.

IBM WebSphere Application Server Liberty是美国国际商业机器（IBM）公司的一款构建于Open Liberty项目之上的Java应用程序服务器。 IBM WebSphere Application Server Liberty 17.0.0.3版本至26.0.0.4版本存在安全漏洞，该漏洞源于未配置身份验证和授权时部署应用程序，可能导致身份欺骗。

CVSS 7.5 · High EPSS 0.37% · P28

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-3621

Vulnerability Information
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Vulnerability Title
IBM WebSphere Application Server Liberty is affected by identity spoofing
Source: CVE Program / CVE List V5
Vulnerability Description
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.4 IBM WebSphere Application Server Liberty is vulnerable to identity spoofing under limited conditions when an application is deployed without authentication and authorization configured.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
IBM WebSphere Application Server Liberty 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM WebSphere Application Server Liberty是美国国际商业机器（IBM）公司的一款构建于Open Liberty项目之上的Java应用程序服务器。 IBM WebSphere Application Server Liberty 17.0.0.3版本至26.0.0.4版本存在安全漏洞，该漏洞源于未配置身份验证和授权时部署应用程序，可能导致身份欺骗。
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
IBM WebSphere Application Server - Liberty 17.0.0.3 ~ 26.0.0.4 cpe:2.3:a:ibm:websphere_application_server___liberty:17.0.0.3:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3621

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III. Intelligence Information for CVE-2026-3621

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Vendor Advisories for CVE-2026-3621 (1)

Same Patch Batch · IBM · 2026-04-22 · 11 CVEs total

CVE-2026-5935 7.3 HIGH TSSC/IMC is vulnerable to OS Command Injection
CVE-2026-5926 6.5 MEDIUM Security vulnerabilities have been found in IBM Verify Identity Access and IBM Security Ve
CVE-2026-1352 6.5 MEDIUM IBM® Db2® is vulnerable to a trap or return SQLCODE -901 when compiling a specially crafte
CVE-2025-36074 5.5 MEDIUM Security vulnerability has been detected in IBM Security Verify Directory
CVE-2026-4918 5.5 MEDIUM IBM Guardium Data Protection is affected by multiple vulnerabilities
CVE-2026-1274 4.9 MEDIUM IBM Guardium Data Protection is affected by multiple vulnerabilities
CVE-2026-4917 4.9 MEDIUM IBM Guardium Data Protection is affected by multiple vulnerabilities
CVE-2026-4919 4.8 MEDIUM IBM Guardium Data Protection is affected by multiple vulnerabilities
CVE-2026-1272 2.7 LOW IBM Guardium Data Protection is affected by multiple vulnerabilities
CVE-2026-1726 Multiple Vulnerabilities in IBM Guardium Key Lifecycle Manager

IV. Related Vulnerabilities

Same product: WebSphere Application Server - Liberty
Same vendor: IBM
Same weakness: CWE-269

V. Comments for CVE-2026-3621

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