CVE-2026-88167 Microsoft CVE debrief

Who should care

Defenders and IT administrators responsible for Microsoft Office and Microsoft 365 Apps for Enterprise deployments should assess exposure and prioritize patching.

Why it matters

CVE-2026-88167 is a medium-severity vulnerability in Microsoft Office Word that allows information disclosure over a network. Defenders should prioritize patching, assess exposure, and monitor for potential disclosure attempts.

• Verify and apply patches to prevent potential information disclosure.
• Assess and mitigate exposure in Microsoft Office Word deployments.
• Monitor for suspicious information disclosure attempts targeting Microsoft Office Word.

Technical summary

A buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. This vulnerability is due to a buffer over-read issue in Microsoft Office Word, which could allow an attacker to access sensitive information. The vulnerability affects Microsoft Office Word and related products. Defenders should prioritize verifying and applying patches from Microsoft, assessing exposure in their environment, and monitoring for potential information disclosure attempts.

Defensive priority

Defenders should prioritize verifying and applying patches from Microsoft, assessing exposure in their environment, and monitoring for potential information disclosure attempts.

Recommended defensive actions

• Verify and apply patches from Microsoft for affected Microsoft 365 Apps for Enterprise and Office versions.
• Assess exposure in your environment for Microsoft Office Word and related products.
• Monitor for potential information disclosure attempts targeting Microsoft Office Word.

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on exploitation or specific impacts. There is no information available on known or unknown affected scope. Defenders should verify and apply patches from Microsoft for affected Microsoft 365 Apps for Enterprise and Office versions, assess exposure in their environment, and monitor for potential information disclosure attempts. The source grounding for this vulnerability is based on

Sources and 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.