Vulnerabilitycritical
Russian hackers are exploiting recently patched Microsoft Office vulnerability (CVE-2026-21509)
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-21509 | Local Security Feature Bypass in Microsoft Office Under Active Exploitation | 7.8 | 71% | KEV | KEV |
From the original article
2 min read at helpnetsecurity.com
Russian state-sponsored hackers Fancy Bear (aka APT 28) are exploiting CVE-2026-21509, a Microsoft Office vulnerability for which Microsoft released an emergency fix last week. CVE-2026-21509 allows unauthorized attackers to bypass a security feature (OLE mitigations in Microsoft 365 and Microsoft Office) locally, by creating and tricking targets into opening booby-trapped Office files.
By @zeljkazorz · helpnetsecurity.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.