---
id: "CVE-2026-113682"
kind: "vulnerability"
aliases: ["CVE-2026-113682"]
title: "light-4j: empty-password Basic auth lets attackers log in as LDAP users"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["active-directory", "java", "ldap", "light-4j", "microservices", "package"]
not_affected_if: ["basic-auth-not-used", "no-ldap-auth", "versions-outside-2.1.5-to-2.4.0"]
published_at: "2026-10-20T16:17:13+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-23T22:39:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113682", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# light-4j: empty-password Basic auth lets attackers log in as LDAP users

light-4j is a Java microservices framework whose BasicAuthHandler accepts an LDAP bind with an empty password as a successful login. An unauthenticated attacker who knows a username can send a Basic Authorization header with an empty password and be logged in as that LDAP or Active Directory user.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Check the light-4j version in the project's pom.xml or build.gradle; affected versions are 2.1.5 up to but not including 2.4.0.

## Fix

Upgrade light-4j to 2.4.0 or later.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113682

## From the sources

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.

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