Microsoft Word Zero-Day Vulnerability Allows Attackers to Bypass Security Features

In a wake-up call for Office users, Microsoft disclosed a serious zero-day vulnerability in Word on February 10, 2026.

Tracked as CVE-2026-21514, this flaw lets attackers bypass key security features with a specially crafted document.

Already exploited in the wild, it demands immediate attention from businesses and individuals alike.

The vulnerability stems from Word’s reliance on untrusted inputs when making security decisions, a classic case of CWE-807.

An attacker crafts a malicious Word file that tricks the app into skipping its own protections. When a victim opens the file locally, it grants high-impact access: stealing data (confidentiality), altering files (integrity), or crashing systems (availability).

No special privileges are needed, but user interaction simply opening the file is required.

Microsoft rates it “Important” with a CVSS v3.1 base score of 7.8. The attack vector is local, complexity low, and exploits are functional and confirmed in attacks.

Good news: Microsoft rolled out an official patch via its February 2026 Patch Tuesday. But with exploitation detected before disclosure, unpatched systems remain at risk.

Metric	Value/Description
CVE ID	CVE-2026-21514
Max Severity	Important
Remediation	Official Fix Available
CVE.org Link	CVE-2026-21514

Picture this: You get an email with an “urgent report.docx.” Clicking opens it in Word. Behind the scenes, the file feeds bad data into Word’s security checks, like a fake ID fooling a bouncer.

Boom sandbox escapes, macros run wild, or sensitive docs leak. It’s local-only, so no remote hacks, but phishing makes it deadly.

Microsoft confirmed public disclosure and active exploits, earning it an “Exploitation Detected” tag. Attackers likely target high-value victims like executives via spear-phishing.

Patch immediately: Update Office via Microsoft Update or the Admin Center. Enable Protected View and macro blocking. Scan endpoints with tools like Microsoft Defender. For enterprises, deploy via WSUS or Intune.

This zero-day highlights why timely updates matter. Word’s billions of users make it a prime target stay vigilant.

Follow us on Google News , LinkedIn and X to Get More Instant Updates. Set Cyberpress as a Preferred Source in Google.

The post Microsoft Word Zero-Day Vulnerability Allows Attackers to Bypass Security Features appeared first on Cyber Security News.