Authentication Bypass in Networknt light-4j Prior to 2.4.0
CVE-2026-113682

9.1CRITICAL

Key Information:

Vendor

Networknt

Status
Light-4j
Vendor
CVE Published:
20 October 2026

What is CVE-2026-113682?

Networknt light-4j versions prior to 2.4.0 expose a vulnerability in the BasicAuthHandler, enabling unauthenticated attackers to log in as LDAP or Active Directory users. By sending a Basic Authorization header with a recognized username coupled with an empty password, attackers can successfully perform an unauthenticated LDAP bind. This flaw allows for unauthorized access, raising significant security concerns for applications leveraging this framework.

Affected Version(s)

light-4j 2.1.5 < 2.4.0

References

https://github.com/networknt/light-4j/issues/2804
issue-tracking
https://github.com/networknt/light-4j/pull/2805
patchissue-tracking
https://github.com/networknt/light-4j/commit/54743badb342...
patch

CVSS V4

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

kta1kri
.