CVE-2026-40459

EUVD-2026-23423
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
LDAP Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 18%
Affected Products (NVD)
VendorProductVersion
pac4jpac4j
4.0.0 ≤
𝑥
< 4.5.10
pac4jpac4j
5.0.0 ≤
𝑥
< 5.7.10
pac4jpac4j
6.0.0 ≤
𝑥
< 6.4.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://cert.pl/en/posts/2026/04/CVE-2026-40458/
https://www.pac4j.org/blog/security-advisory-pac4j-core-and-ldap.html