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Microsoft Windows flaw added to the list of vulnerabilities attackers are using

On 13 October 2026, CISA added a flaw in Microsoft Windows (CVE-2026-96951) to its Known Exploited Vulnerabilities Catalog. A flaw is listed there only when attackers are already using it.

Released by CISA Known Exploited Vulnerabilities Catalog. We read it on .

01

What does the source say?

Microsoft Windows Shell contains a command injection vulnerability that allows an unauthorized attacker to bypass a security feature over a network.

02

What does it mean for a small firm?

Windows runs on most office computers and many small firm servers. When a flaw is on this list, attackers are already using it in real attacks, not only in a laboratory. A computer that has not installed the update is open to a working attack.

The agency gave US federal agencies until 16 October 2026 to apply the fix.

03

What should I check?

  1. Open Windows Update on every computer and server the firm runs, and install every update waiting.
  2. Check the maker's own security notice for the flaw and confirm each machine is on a fixed version.
  3. Turn on automatic updates so the next fix is installed without waiting for someone to remember.

Some of this can be seen from outside a firm, from its public side. Some cannot, such as the inside of a device or an account. What we cover lists both. What we cover

Sources

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