PatchSiren cyber security CVE debrief

CVE-2026-41720 Spring CVE debrief

CVE-2026-41720 is a high-severity vulnerability in Spring LDAP's DirContextAuthenticationStrategy implementations. The vulnerability occurs when a non-empty username is paired with an empty or null password, allowing an authentication bypass. Affected versions include Spring LDAP 2.4.0 through 2.4.4, 3.2.0 through 3.2.17, 3.3.0 through 3.3.7, and 4.0.0 through 4.0.3.

Vendor: Spring
Product: Spring LDAP
CVSS: HIGH 7.4
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-09
Original CVE updated: 2026-06-09
Advisory published: 2026-06-09
Advisory updated: 2026-06-09

Who should care

Users of Spring LDAP, particularly those using versions 2.4.0 through 2.4.4, 3.2.0 through 3.2.17, 3.3.0 through 3.3.7, and 4.0.0 through 4.0.3, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The DirContextAuthenticationStrategy implementations in Spring LDAP do not properly reject bind requests with non-empty usernames and empty or null passwords, leading to an authentication bypass vulnerability.

Defensive priority

High

Recommended defensive actions

Upgrade to a non-vulnerable version of Spring LDAP.
Implement additional authentication mechanisms to prevent unauthorized access.

Evidence notes

The CVE-2026-41720 vulnerability was published on June 9, 2026, and has a CVSS score of 7.4.

Official resources

CVE-2026-41720 was published on [2026-06-09T05:16:35.377Z].