Microsoft patches six actively exploited vulnerabilities
Microsoft patched multiple vulnerabilities in February 2026, with six CVEs actively exploited in the wild requiring immediate patching.
Sourceipa.go.jp — open the original
What to check
- Applies to
- The 6 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-21510, CVE-2026-21513, CVE-2026-21514, CVE-2026-21519, CVE-2026-21525, and CVE-2026-21533 as exploited in the wild.
On February 11, 2026 (Japan time), Microsoft released its monthly security update addressing multiple vulnerabilities across its product line. The Japan Information-technology Promotion Agency (IPA) issued an advisory warning that exploitation of these vulnerabilities could lead to application crashes, remote system compromise, and various other impacts.
Microsoft has confirmed active exploitation of six vulnerabilities: CVE-2026-21510, CVE-2026-21513, CVE-2026-21514, CVE-2026-21519, CVE-2026-21525, and CVE-2026-21533. Given the confirmed in-the-wild exploitation, IPA emphasizes immediate application of security updates to prevent further compromise. The advisory notes particular urgency due to the risk of expanding damage from these actively exploited flaws.
Organizations are advised to deploy patches immediately through Windows Update, which typically occurs automatically. Enterprise environments with centralized update management should prioritize deployment of these patches, noting that system restarts may be required to complete installation.
Mentioned in this report
Source reporting: https://www.ipa.go.jp/security/security-alert/2025/0212-ms.html
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,433 reports from 149 sources, 661 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs