by Kastro
Paper/Archive/CVE-2026-113682

CVE-2026-113682

networknt light-4j — Networknt light-4j 2.1.5 before 2.4.0 Authentication Bypass via Empty LDAP Password

EPSS 0.6%CVSS 9.1
critical.is priorityof 100
37
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 46.7.467 × 209.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
light-4j2.1.5 – < 2.4.02.4.0CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/networknt/light-4j/issues/2804patchgithub.com/networknt/light-4j/pull/2805patchgithub.com/networknt/light-4j/commit/54743badb34260b76ed131d8b6a4f60210cc3673refgithub.com/networknt/light-4j/releases/tag/2.4.0writeupgithub.com/networknt/light-4j/blob/2.3.7/basic-auth/src/main/java/com/networknt/basicauth/BasicAuthHandler.java#L189-L200writeupgithub.com/networknt/light-4j/blob/2.3.7/ldap-util/src/main/java/com/networknt/ldap/LdapUtil.java#L152-L173writeupvulncheck.com/advisories/networknt-light-4j-2.1.5-before-2.4.0-authentication-bypass-via-empty-ldap-password