Vulnerability · Published Apr 17, 2026 · Assigned by CERT-PL
CVE-2026-40459LDAP Injection in PAC4J
High 8.7
In plain English
A high-severity security flaw in PAC4J from PAC4J. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.6%top 50.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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
Affected products (as reported)
Weakness: CWE-90 · Vector: 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
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.html vendor-advisory