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CVE-2026-85374 Microsoft CVE debrief

A Windows Installer Information Disclosure Vulnerability exists due to an out-of-bounds read in Windows Installer. An authorized attacker can exploit this vulnerability locally to disclose information. This vulnerability affects Windows systems, particularly those using affected versions. Defenders should assess exposure and apply patches. The vulnerability allows local information disclosure, and patching is required for affected versions. Inventory and assessment are necessary to address potential risks.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows systems, particularly those using affected versions, should assess exposure and apply patches. This includes IT administrators, security teams, and operators managing Windows deployments. They should inventory and assess exposure, verify and apply patches, and monitor systems for potential information disclosure.

Why it matters

CVE-2026-85374 allows local information disclosure in Windows Installer. Defenders should inventory and assess exposure, verify and apply patches, and monitor systems.

  • Local information disclosure possible
  • Patching required for affected versions
  • Inventory and assessment necessary

Technical summary

The vulnerability exists due to an out-of-bounds read in Windows Installer. An authorized attacker can exploit this vulnerability locally to disclose information. The vulnerability affects Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, and Windows 11 Version 24H2. Defenders should apply patches immediately for affected Windows versions.

Defensive priority

Apply patches immediately for affected Windows versions

Recommended defensive actions

  • Inventory and assess exposure of Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11
  • Verify and apply Microsoft patches for affected Windows versions
  • Monitor Windows systems for potential information disclosure

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the affected versions. The vulnerability has been publicly disclosed, and defenders should verify and apply patches for affected Windows versions. The CVE record was published on 2026-10-13T19:00:04.485Z and has not been modified since then. Official records from CVE Program and NVD confirm the vulnerability's existence.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85374 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85374

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

  • CVE-2026-85374 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85374

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

Supplemental references

  • Windows Installer Information Disclosure Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/85xxx/CVE-2026-85374.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85374

    Supplemental source - vendor-advisory, patch

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.