Auth bypass in Networknt Light-4j
CVE-2026-113682
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.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/networknt/light-4j/issues/2804 (issue-tracking)
- github.com/networknt/light-4j/pull/2805 (issue-tracking, patch)
- github.com/networknt/light-4j/commit/54743badb34260b76ed131d8b6a4f60210cc3673 (patch)
- github.com/networknt/light-4j/releases/tag/2.4.0 (release-notes)
- github.com/networknt/light-4j/blob/2.3.7/basic-auth/src/main/java/com/networknt… (technical-description)
- github.com/networknt/light-4j/blob/2.3.7/ldap-util/src/main/java/com/networknt/… (technical-description)
- www.vulncheck.com/advisories/networknt-light-4j-2.1.5-before-2.4.0-authenticati… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-113682?
- CVE-2026-113682 is a high-severity vulnerability in Networknt Light-4j, classified under Improper Authentication. CVSS score: 7.4/10. Published 2026-10-20.
- How severe is CVE-2026-113682?
- High severity. CVSS v3 base score is 7.4 out of 10.