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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 3
- StatusPublished → DeferredNVD modified 2026-10-20 20:11
- StatusReceived → PublishedNVD modified 2026-10-20 15:40
- First seenCVSS 9.1NVD modified 2026-10-20 16:17
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 7
- https://github.com/networknt/light-4j/blob/2.3.7/basic-auth/src/main/java/com/networknt/basicauth/BasicAuthHandler.java#L189-L200
- https://github.com/networknt/light-4j/blob/2.3.7/ldap-util/src/main/java/com/networknt/ldap/LdapUtil.java#L152-L173
- https://github.com/networknt/light-4j/commit/54743badb34260b76ed131d8b6a4f60210cc3673
- https://github.com/networknt/light-4j/issues/2804
- https://github.com/networknt/light-4j/pull/2805
- https://github.com/networknt/light-4j/releases/tag/2.4.0
- https://www.vulncheck.com/advisories/networknt-light-4j-2.1.5-before-2.4.0-authentication-bypass-via-empty-ldap-password