Patch tracker / KB5120233
KB5120233: Windows Server 2022 Security Update (August 2026)
KB5120233 is a Critical security update for Windows Server 2022, released 2026-08-11. It closes 215 CVEs with a maximum CVSS of 9.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. The most likely of them to be attacked is CVE-2026-42976, which FIRST.org rates at 54% probability of exploitation in the next 30 days.
Update summary
Fixes 215 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 6.2%. Among the top half of tracked Microsoft updates by EPSS exploit probability.
Microsoft documents 1 known issue with this update.
- Windows Server Update Services (WSUS) does not display error details
Senserva AI Opinion and rich prompt for KB5120233
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5120233
- Released
- 2026-08-11
- Last changed
- 2026-08-24
- Changes tracked
- 6
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
The strongest signal is the steady upward creep in fixed CVEs for KB5120233, rising from 213 to 214 on 2026-08-12 and then to 215 on 2026-08-20. This gradual, one-at-a-time increase over about a week shows the update is still absorbing new fixes, so IT admins should apply the latest revision today and expect further additions.
- 2026-08-12 CVEs fixed 213 to 214
- 2026-08-20 CVEs fixed 214 to 215
Recorded by Senserva on the dates shown, from the MSRC release feed. This is what moved and when, which neither the vendor advisory nor NVD publishes.
Check if KB5120233 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5120233 (checked 2026-08-25). Verify against the article before acting.
Windows Server Update Services (WSUS) does not display error details
After installing KB5070881 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287 .
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
What the press says about this update
Trusted-source coverage of the CVEs this update fixes, pulled live from their own feeds.
Scope and sources
- Affected products
- Also released in August 2026
KB5002882
39 CVEs · Critical · exploitedKB5002883
40 CVEs · Critical · exploitedKB5002891
40 CVEs · Critical · exploitedKB5120228
215 CVEs · Critical · exploitedKB5120229
195 CVEs · Critical · exploitedKB5120238
183 CVEs · Critical · exploitedKB5120240
171 CVEs · Critical · exploitedKB5120242
195 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.