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CVE-2026-59270 Spring CVE debrief

The CVE-2026-59270 vulnerability affects Spring Security's embedded UnboundID LDAP server, which unconditionally registers an administrative credential and binds its listener to all available network interfaces. This critical vulnerability impacts multiple versions of Spring Security, including 5.7.0-5.7.25, 5.8.0-5.8.27, 6.4.0-6.4.18, 6.5.0-6.5.11, 7.0.0-7.0.6, and 7.1.0. Security teams and administrators responsible for Spring Security installations should be aware of this critical vulnerability and take immediate action to assess and mitigate the risk. The CVE record was published on 2026-08-27T06:17:21.223Z and has not been modified since then.

Vendor
Spring
Product
Spring Security
CVSS
CRITICAL 9.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-27
Original CVE updated
2026-09-01
Advisory published
2026-08-27
Advisory updated
2026-09-01

Who should care

Security teams and administrators responsible for Spring Security installations should be aware of this critical vulnerability and take immediate action to assess and mitigate the risk. This includes reviewing and updating incident response plans, conducting vulnerability scanning and penetration testing, and developing and implementing a remediation plan.

Technical summary

The CVE-2026-59270 vulnerability is caused by the embedded UnboundID LDAP server in Spring Security, which unconditionally registers an administrative credential and binds its listener to all available network interfaces. This issue has been addressed in later versions of Spring Security. The vulnerability affects multiple versions of Spring Security, including 5.7.0-5.7.25, 5.8.0-5.8.27, 6.4.0-6.4.18, 6.5.0-6.5.11, 7.0.0-7.0.6, and 7.1.0.

Defensive priority

Immediate attention is recommended due to the critical severity of this vulnerability.

Recommended defensive actions

  • Inventory and assess affected Spring Security versions
  • Apply vendor patches or upgrades to vulnerable versions
  • Implement compensating controls, such as network segmentation and monitoring
  • Verify and monitor for potential exploitation attempts
  • Review and update incident response plans
  • Conduct vulnerability scanning and penetration testing
  • Develop and implement a remediation plan

Evidence notes

The CVE-2026-59270 vulnerability affects multiple versions of Spring Security, including 5.7.0-5.7.25, 5.8.0-5.8.27, 6.4.0-6.4.18, 6.5.0-6.5.11, 7.0.0-7.0.6, and 7.1.0. The vulnerability is caused by the embedded UnboundID LDAP server in Spring Security, which unconditionally registers an administrative credential and binds its listener to all available network interfaces. This issue has been addressed in later versions of Spring Security.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-59270 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-59270

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

  • CVE-2026-59270 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-59270

    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.