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PatchSiren cyber security CVE debrief

CVE-2026-68813 Microsoft CVE debrief

Microsoft Excel Information Disclosure Vulnerability allows an unauthorized attacker to disclose information locally through an out-of-bounds read in Microsoft Office Excel. This vulnerability has a CVSS score of 5.5 and is considered MEDIUM severity. The vulnerability affects Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac, and other products. Defenders should prioritize verifying and updating affected products to prevent potential information disclosure. The CVE record and source item provide details on the vulnerability, including its description, CVSS score, and affected products. However, there is limited information on exploitation or A

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-10-08
Advisory published
2026-08-11
Advisory updated
2026-10-08

Who should care

Defenders responsible for Microsoft Office and Excel deployments should assess exposure and prioritize updates to prevent potential information disclosure.

Why it matters

CVE-2026-68813 is a MEDIUM severity vulnerability in Microsoft Excel that allows local information disclosure. Defenders should prioritize verifying and updating affected products to prevent potential information disclosure.

  • Verify and update Microsoft Excel and related Office products to prevent potential information disclosure.
  • Implement compensating controls to detect and prevent potential information disclosure.
  • Monitor systems for suspicious activity related to Microsoft Excel.

Technical summary

The vulnerability is caused by an out-of-bounds read in Microsoft Office Excel, allowing an unauthorized attacker to disclose information locally. The affected products include Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac, and others.

Defensive priority

Defenders should prioritize verifying and updating Microsoft Excel and related Office products to prevent potential information disclosure.

Recommended defensive actions

  • Verify and update Microsoft Excel and related Office products to the latest versions.
  • Review and implement compensating controls to detect and prevent potential information disclosure.
  • Monitor systems for suspicious activity related to Microsoft Excel.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, CVSS score, and affected products. However, there is limited information on exploitation or specific attack scenarios.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-68813 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-68813

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

  • CVE-2026-68813 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-68813

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

Supplemental references

  • Microsoft Excel Information Disclosure Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/68xxx/CVE-2026-68813.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68813

    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.