CVE-2026-40459

High

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

SeverityHigh

CVSS8.8

Exploit probability—

ProductPac4j

PublishedApr 17, 2026

First seenApr 17, 2026

Weakness typeCWE-90CWE-90

How to fix

Update

pac4j pac4j4.5.10, 5.7.10, 6.4.1 or later

Vendor advisories

pac4j.org/blog/security-advisory-pac4j-core-and-ldap.html

Affected products

Product	Affected versions	Fixed in
pac4j pac4j	4.0.0 ≤ v < 4.5.10, 5.0.0 ≤ v < 5.7.10, 6.0.0 ≤ v < 6.4.1	4.5.10, 5.7.10, 6.4.1

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