CVE-2026-113682: Improper Authentication in networknt light-4j
Description
Networknt light-4j versions from 2.1.5 up to but not including 2.4.0 contain an authentication bypass vulnerability in the BasicAuthHandler. This flaw allows unauthenticated attackers to log in as LDAP/AD-delegated users by sending a Basic Authorization header with a known username and an empty password. The vulnerability results from an unauthenticated LDAP bind being accepted as successful authentication.
CVSS v4.0
Score 9.1critical
Affected software
networknt
light-4j
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-113682 describes an authentication bypass in networknt light-4j's BasicAuthHandler affecting versions >=2.1.5 and <2.4.0. Attackers can exploit this by sending a Basic Authorization header with a valid username but an empty password, which triggers an LDAP bind that is incorrectly accepted as successful authentication. This allows unauthorized access as LDAP/AD-delegated users without valid credentials.
Potential Impact
Successful exploitation allows unauthenticated attackers to bypass authentication controls and gain access as LDAP/AD-delegated users. This can lead to unauthorized access to protected resources and potentially escalate privileges within affected systems. The CVSS 4.0 score of 9.1 indicates a critical severity with network attack vector, low attack complexity, no user interaction, and high impact on confidentiality and integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the affected service and consider disabling BasicAuthHandler or LDAP/AD delegation if feasible. Monitor for updates from networknt regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-20T14:51:02.860Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad78d892cdf04f6563d7709
Added to database: 10/20/2026, 15:49:29 UTC
Last enriched: 10/20/2026, 16:03:25 UTC
Last updated: 10/20/2026, 19:06:08 UTC
Views: 9
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