CVE-2026-40459

LDAP Injection in PAC4J

State: Published
Severity: 8.7 High
Published: Apr 17, 2026
Updated: Apr 17, 2026
Reserved: Apr 13, 2026

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

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	CERT-PL

Weaknesses

CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Affected Products

Product	Versions
PAC4JPAC4J	4.0 to before 4.5.10Affected 5.0 to before 5.7.10Affected 6.0 to before 6.4.1Affected

References

https://cert.pl/en/posts/2026/04/CVE-2026-40458/third-party-advisory
https://www.pac4j.org/blog/security-advisory-pac4j-core-and-ldap.htmlvendor-advisory

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