PatchSiren

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
2026-06-23
Advisory published
2026-06-09
Advisory updated
2026-06-23

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41720 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41720

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41720 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41720

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.