CVE-2026-78510

Think of Microsoft Word as a doorway into your computer. This flaw is like a crack in the door where a bad actor can potentially slip in and make the computer run their code remotely. If you’re using affected Office/Word versions, installing the Microsoft fix is the best way to close that crack.

This matters if you use Microsoft Word as part of Microsoft 365 Apps / Microsoft Office (including the Office LTSC for Mac 2021/2024 and Microsoft Office 2016/2019/2021/2024 lines listed). The risk is tied to having a vulnerable Word build in place; exploitation requires an attacker to reach and trigger the vulnerable behavior through network-facing access paths. Based on the findings provided, no public exploit code is currently on record, but you should still treat this as urgent because it’s a remote code execution issue in widely used software.

Verdict: RED. Attackers are actively targeting this class of high-impact Office remote code execution flaws, and this one is covered by Microsoft patch guidance for affected Word installations. Even though no public exploit code is on record and it’s not listed in CISA KEV, the impact (remote code execution) is severe enough that you should prioritize updating immediately.