PAC4J LDAP Injection in ID-based Search (v <4.5.10/5.7.10/6.4.1)
CVE-2026-40459 Published on April 17, 2026
LDAP Injection in PAC4J
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
Vulnerability Analysis
CVE-2026-40459 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a LDAP Injection Vulnerability?
The software constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.
CVE-2026-40459 has been classified to as a LDAP Injection vulnerability or weakness.
Affected Versions
PAC4J:- Version 4.0 and below 4.5.10 is affected.
- Version 5.0 and below 5.7.10 is affected.
- Version 6.0 and below 6.4.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.