CVE-2026-113682
Networknt light-4j 2.1.5 before 2.4.0 Authentication Bypass via Empty LDAP Password
networknt light-4j
CVSS
9.1CriticalExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.48%Chance of exploitation activity in the next 30 days, higher than 40% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 2.4.0light-4jCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
Networknt light-4j from 2.1.5 before 2.4.0 contains an authentication bypass vulnerability in BasicAuthHandler that allows unauthenticated attackers to log in as LDAP/AD-delegated users. Attackers can send a Basic Authorization header with a known username and empty password, triggering an unauthenticated LDAP bind that is accepted as successful authentication.
Text from CVE List
Affected versions 1
- light-4jaffected: 2.1.5 before 2.4.0CVE List
References 7
- github.com/networknt/light-4j/pull/2805Fixvia CVE List
- github.com/networknt/light-4j/commit/54743badb34260b76ed131d8b6a4f60210cc3673Fixvia CVE List
- github.com/networknt/light-4j/releases/tag/2.4.0Fixvia CVE List
- vulncheck.com/advisories/networknt-light-4j-2.1.5-before-2.4.0-authentication-bypass-via-empty-ldap-passwordAdvisoryvia CVE List
- github.com/networknt/light-4j/issues/2804Referencevia CVE List
- github.com/networknt/light-4j/blob/2.3.7/basic-auth/src/main/java/com/networknt/basicauth/BasicAuthHandler.java#L189-L200Referencevia CVE List
- github.com/networknt/light-4j/blob/2.3.7/ldap-util/src/main/java/com/networknt/ldap/LdapUtil.java#L152-L173Referencevia CVE List