Patch tracker / CVE reference / CVE-2026-55021
CVE-2026-55021
CVE-2026-55021 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.3 (High). Its EPSS score puts the probability of exploitation in the next 30 days at 70%. Microsoft has shipped the fix: deploy one of the 3 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
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Risk summary
Not in the CISA KEV catalog. EPSS exploit probability 70%. CVSS 7.3 (High).
This CVE is among the top 10% of tracked Microsoft CVEs by EPSS exploit probability.
Senserva AI Opinion and rich prompt for CVE-2026-55021
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-55021
High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5002882, KB5002883, KB5002891 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security updates below to fix CVE-2026-55021. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.
Scope and sources
- Affected products
- Fixed by the same updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.