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PatchSiren cyber security CVE debrief

CVE-2026-26155 Microsoft CVE debrief

Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability affects multiple Windows versions, allowing potential information disclosure. This Medium-severity vulnerability, with a CVSS score of 6.5, requires patching to prevent exploitation. Defenders and IT administrators should assess exposure, verify system configurations, update management processes, and monitor for incidents. The vulnerability's impact is limited to information disclosure, and there is no evidence of exploitation or specific attacks.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders and IT administrators responsible for Windows systems, particularly those using affected versions, should assess exposure and prioritize patching.

Why it matters

CVE-2026-26155 is a Medium-severity information disclosure vulnerability in Microsoft's Local Security Authority Subsystem Service. Defenders should prioritize patching affected Windows 10, Windows 11, and Windows Server versions to prevent potential information disclosure. Verify system configurations, update management processes, and monitor for incidents.

  • Potential information disclosure
  • Requires patching to prevent exploitation
  • Verify system configurations and update management processes
  • Monitor for potential information disclosure incidents

Technical summary

The Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability affects multiple Windows versions, allowing for information disclosure. The vulnerability has a CVSS score of 6.5 and is classified as Medium severity. It is essential to patch affected Windows 10, Windows 11, and Windows Server versions to prevent potential information disclosure. Verify system configurations, update management processes, and monitor for incidents.

Defensive priority

Medium

Recommended defensive actions

  • Patch affected Windows 10, Windows 11, and Windows Server versions
  • Verify system configurations and update management processes
  • Monitor for potential information disclosure incidents

Evidence notes

The CVE record and Microsoft's advisory provide details on the vulnerability. However, there is no information on exploitation or specific attacks. The CVE Program record (CVE-2026-26155) and NIST NVD vulnerability detail (CVE-2026-26155) offer additional context. Defenders should verify system configurations, update management processes, and monitor for potential information disclosure incidents.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26155 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26155

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

  • CVE-2026-26155 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26155

    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.