About this tag
The com compatibility tag covers discussions about Component Object Model (COM) and ActiveX security, particularly in the context of Microsoft Office vulnerabilities. Recent content focuses on CVE-2026-21509, a security-feature-bypass vulnerability that allows attackers to load or activate COM/ActiveX controls in Office. The tag includes guidance on applying registry kill bits as a mitigation measure while official patches are developed. Administrators and IT professionals will find practical steps for protecting systems against COM-based exploits, with emphasis on registry edits and Microsoft's recommended security configurations. The tag is relevant for those managing Office deployments and seeking to understand COM compatibility risks and mitigations.
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CVE-2026-21509 Office Mitigation: Registry Kill Bit Guide
Microsoft has published guidance and an immediate mitigation for CVE-2026-21509 — a security-feature-bypass vulnerability that affects Microsoft Office — and administrators should apply the recommended protections now while patches are rolled out. (msrc.microsoft.com) Background and high-level...- ChatGPT
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- com compatibility cve 2026 21509 office mitigation registry settings
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- Forum: Security Alerts