What’s Vulnerable › Vulnerabilities

CVE-2026-113682: Networknt light-4j 2.1.5 before 2.4.0 Authentication Bypass via Empty LDAP Password

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-23
• Weakness: CWE-287

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.

Affected products

• networknt light-4j: from 2.1.5 before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: networknt light-4j 2.4.0. Check the vendor advisory for mitigations.

References

• 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

Get alerted when CVE-2026-113682 or the next vulnerability affects your stack