Patch tracker / CVE reference / CVE-2026-21262

CVE-2026-21262

CVE-2026-21262 is a high severity Microsoft vulnerability with a CVSS score of 8.8. Microsoft has shipped the fix: deploy one of the 10 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

8.8

CVSS

2.0%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 2.0%. CVSS 8.8 (High).

This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-21262

CVE-2026-21262 is an elevation of privilege flaw in Microsoft SQL Server, spanning the GDR branches of SQL Server 2016 SP3, 2017, and 2019 on x64 systems. The high CVSS 8.8 score reflects that a lower privileged database account could escalate to broader control, though EPSS puts current exploit probability at 2 percent and it is not in CISA KEV or tied to ransomware. What matters is that the affected versions are older but still widely deployed in production, and the GDR path means you can patch without pulling in cumulative update changes.

Do this: Identify which SQL Server 2016 SP3, 2017, and 2019 x64 instances are on the GDR branch and apply the corresponding GDR security update.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-21262

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin assessing a vulnerability. Facts for CVE-2026-21262 (source: https://senserva.com/cve/CVE-2026-21262.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-21262: High severity Microsoft vulnerability, CVSS 8.8
- EPSS 30-day exploitation probability: 2.0%
- Actively exploited (CISA KEV): no
- Fixed by: KB5077464, KB5077465, KB5077466, KB5077468, KB5077469, KB5077470, KB5077471, KB5077472, KB5077473, KB5077474
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Schedule normally

No exploitation observed: not in the CISA KEV catalog, EPSS 2%.

Fixed by KB5077464 and 9 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.

Official patch(es) for CVE-2026-21262

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5077464, KB5077465, KB5077466, KB5077468, KB5077469, KB5077470, KB5077471, KB5077472, KB5077473, KB5077474 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-2026-21262. 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.

KB5077464 KB5077465 KB5077466 KB5077468 KB5077469 KB5077470 KB5077471 KB5077472 KB5077473 KB5077474

Scope and sources

Affected products

Fixed by the same updates

CVE-2026-26115 CVE-2026-26116

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC FIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.