CVE-2026-21514 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-807** (Security Feature Bypass). ⚠️ **Flaw**: The application fails to properly validate or enforce security mechanisms, allowing unauthorized actions or data access.

Q: Who is affected? (Versions/Components)

📦 **Affected Products**: • Microsoft 365 Apps for Enterprise (32-bit & 64-bit) • Microsoft Office LTSC for Mac 2021 • Other Microsoft Office variants (truncated in data)

Q: Is there a public Exp? (PoC/Wild Exploitation)

🕵️ **Public Exploit**: **No**. • `pocs` array is empty. • No wild exploitation reported yet. • Relies on vendor advisory for details.

Q: How to self-check? (Features/Scanning)

🔍 **Self-Check**: 1. Verify Office version (M365 or LTSC Mac 2021). 2. Check for latest security updates. 3. Monitor for unusual Word behavior or security warnings being ignored.

Q: What if no patch? (Workaround)

🛑 **No Patch Workaround**: • Disable macro execution if possible. • Use Protected View for untrusted documents. • Restrict file opening to trusted sources only.

Q: Is it urgent? (Priority Suggestion)

⚡ **Urgency**: **HIGH**. • CVSS Score indicates **High** severity (C:H, I:H, A:H). • Low complexity + No auth needed = Easy target. • **Action**: Patch immediately upon release.

Updated May 06, 2026 CVSS 7.8 · High

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Microsoft Word has a **Security Feature Bypass** vulnerability.…

Read full answer (login)

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-807** (Security Feature Bypass). <br>⚠️ **Flaw**: The application fails to properly validate or enforce security mechanisms, allowing unauthorized actions or data access.

Q3Who is affected? (Versions/Components)

📦 **Affected Products**: <br>• Microsoft 365 Apps for Enterprise (32-bit & 64-bit) <br>• Microsoft Office LTSC for Mac 2021 <br>• Other Microsoft Office variants (truncated in data)

Q4What can hackers do? (Privileges/Data)

💻 **Attacker Capabilities**: <br>• **Privileges**: Local access required (AV:L). <br>• **Data**: High risk of data exposure (C:H) and modification (I:H).…

Read full answer (login)

Q5Is exploitation threshold high? (Auth/Config)

🔓 **Exploitation Threshold**: <br>• **Auth**: No privileges needed (PR:N). <br>• **UI**: User interaction required (UI:R) – e.g., opening a malicious file. <br>• **Complexity**: Low (AC:L).…

Read full answer (login)

Q6Is there a public Exp? (PoC/Wild Exploitation)

🕵️ **Public Exploit**: **No**. <br>• `pocs` array is empty. <br>• No wild exploitation reported yet. <br>• Relies on vendor advisory for details.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: <br>1. Verify Office version (M365 or LTSC Mac 2021). <br>2. Check for latest security updates. <br>3. Monitor for unusual Word behavior or security warnings being ignored.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Official Fix**: **Yes**. <br>• Microsoft has issued an advisory. <br>• Link: [MSRC Update Guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514).…

Read full answer (login)

Q9What if no patch? (Workaround)

🛑 **No Patch Workaround**: <br>• Disable macro execution if possible. <br>• Use Protected View for untrusted documents. <br>• Restrict file opening to trusted sources only.

Q10Is it urgent? (Priority Suggestion)

⚡ **Urgency**: **HIGH**. <br>• CVSS Score indicates **High** severity (C:H, I:H, A:H). <br>• Low complexity + No auth needed = Easy target. <br>• **Action**: Patch immediately upon release.

Continue exploring

Vulnerability detail Full AI analysis (login) Microsoft CWE-807