CVE-2026-40459— LDAP Injection in PAC4J
Quick assessment
Affected
PAC4J PAC4J
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.
pac4j是pac4j开源的一个简单而强大的 Java 安全引擎。用于验证用户、获取他们的配置文件和管理授权，以保护 Web 应用程序和 Web 服务。 pac4j 4.5.10之前版本、5.7.10之前版本和6.4.1之前版本存在安全漏洞，该漏洞源于多个方法中存在LDAP注入，可能导致低权限远程攻击者将特制的LDAP语法注入基于ID的搜索参数，从而执行未经授权的LDAP查询和任意目录操作。
Possible ATT&CK Techniques 1 AI
T1110.004 · Credential Stuffing
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I. Basic Information for CVE-2026-40459
Vulnerability Information
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Vulnerability Title
LDAP Injection in PAC4J
Source: CVE Program / CVE List V5
Vulnerability Description
PAC4J is vulnerable to LDAP Injection in multiple methods. A low-privileged remote attacker can inject crafted LDAP syntax into ID-based search parameters, potentially resulting in unauthorized LDAP queries and arbitrary directory operations.
This issue was fixed in PAC4J versions 4.5.10, 5.7.10 and 6.4.1
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
Source: CVE Program / CVE List V5
Vulnerability Title
pac4j 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pac4j是pac4j开源的一个简单而强大的 Java 安全引擎。用于验证用户、获取他们的配置文件和管理授权，以保护 Web 应用程序和 Web 服务。 pac4j 4.5.10之前版本、5.7.10之前版本和6.4.1之前版本存在安全漏洞，该漏洞源于多个方法中存在LDAP注入，可能导致低权限远程攻击者将特制的LDAP语法注入基于ID的搜索参数，从而执行未经授权的LDAP查询和任意目录操作。
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
II. Public POCs for CVE-2026-40459
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Security Blog Posts for CVE-2026-40459 (1)
IV. Related Vulnerabilities
Same product: PAC4J
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CVE-2026-82464
pac4j-core before 6.5.6 Open Redirect via Backslash Logout -
CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned Log -
CVE-2026-82463
pac4j-core before 6.5.6 Authorization Bypass via Reversed Pr -
CVE-2026-82462
pac4j-oidc before 6.5.6 Authentication Bypass via Access Tok -
CVE-2026-82461
pac4j-oidc before 6.5.6 Privilege Escalation via Unverified
Same vendor: PAC4J
-
CVE-2026-82464
pac4j-core before 6.5.6 Open Redirect via Backslash Logout -
CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned Log -
CVE-2026-82463
pac4j-core before 6.5.6 Authorization Bypass via Reversed Pr -
CVE-2026-82462
pac4j-oidc before 6.5.6 Authentication Bypass via Access Tok -
CVE-2026-82461
pac4j-oidc before 6.5.6 Privilege Escalation via Unverified
Same weakness: CWE-90
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Apache APISIX: ldap-auth plugin cross-subtree identity imper -
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Blind LDAP Injection in Sign-In Endpoint in TÜBİTAK BİLGEM's -
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Filter Injection through Action Parameters in AD LDAP app fo -
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V. Comments for CVE-2026-40459
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