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PatchSiren cyber security CVE debrief

CVE-2026-85875 Microsoft CVE debrief

Microsoft Office Excel is vulnerable to an out-of-bounds read, allowing unauthorized attackers to disclose information locally. The CVE record was published on 2026-09-08T18:21:13.807Z. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. Defenders should assess exposure and prioritize patching and verification for Excel and Office deployments. The NVD entry is currently Analyzed, but specific version details and exploitation status are not provided. The CVE Program record and NVD detail page provide information on the vulnerability.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-17
Advisory published
2026-09-08
Advisory updated
2026-09-17

Who should care

Defenders responsible for Microsoft Office Excel and Office deployments should assess exposure and prioritize patching and verification. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

CVE-2026-85875 is a medium-severity vulnerability in Microsoft Office Excel that allows local information disclosure. Defenders should prioritize patching and verification for Excel and Office deployments.

  • Verify and inventory vulnerable Excel and Office deployments
  • Apply patches for Microsoft Office Excel and Office
  • Monitor for potential local information disclosure attempts

Technical summary

The CVE-2026-85875 vulnerability is an out-of-bounds read in Microsoft Office Excel, which allows unauthorized attackers to disclose information locally. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. The CVE record was published on 2026-09-08T18:21:13.807Z and has not been modified since then. The NVD entry is currently Analyzed, but specific version details and exploitation status are not provided.

Defensive priority

Medium-priority patching and verification recommended for Excel and Office deployments.

Recommended defensive actions

  • Apply patches for Microsoft Office Excel and Office
  • Verify and inventory vulnerable Excel and Office deployments
  • Monitor for potential local information disclosure attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but specific version details and exploitation status are not provided. The CVE Program record and NVD detail page are the primary sources for this information. The vulnerability has not been modified since its publication on 2026-09-08T18:21:13.807Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85875 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85875

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

  • CVE-2026-85875 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85875

    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.