Patch tracker / KB5121003
KB5121003: Windows Server 2022 Security Update (August 2026)
KB5121003 is a Critical security update for Windows Server 2022, released 2026-08-11. It closes 196 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 196 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.
- Reports of certain games becoming unresponsive
Senserva AI Opinion and rich prompt for KB5121003
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5121003
- 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 single recorded change on 2026-08-20, when the CVE fix count moved from 195 to 196. This is a single point with no earlier history to compare against, so the direction is a modest increase of one addressed CVE. For an IT admin today, treat this as a stable update with incremental coverage and plan deployment accordingly.
- 2026-08-20 CVEs fixed 195 to 196
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 KB5121003 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5121003 (checked 2026-08-25). Verify against the article before acting.
Reports of certain games becoming unresponsive
Symptoms
Microsoft received reports of issues involving inability to run certain games as expected after installing this update.
Ongoing investigation indicates that this issue is associated with certain peripherals or internal device components that support RGB lighting features. These devices might install drivers or software components with file names similar to inpoutx64 . On systems where these drivers are found, launching certain games can trigger this issue.
Games identified in reports of this issue include ARC Raiders, MARVEL Tōkon: Fighting Souls, and THE FINALS. Reported symptoms include:
the game application becomes unresponsive
the game application closes without notice
the error "EXCEPTION_ACCESS_VIOLATION" is displayed
the device restarts without warning
If you are experiencing this issue or a similar issue, please use Feedback Hub to submit a report. You can open Feedback Hub by pressing the Windows logo key + F . For additional information, see Send feedback to Microsoft with the Feedback Hub app . Your reports are helpful to our investigation.
Workaround
This issue can be prevented by temporarily disabling the inpoutx64 driver using the Windows registry.
Important
This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you ...
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 · exploitedKB5120233
215 CVEs · Critical · exploitedKB5120238
183 CVEs · Critical · exploitedKB5120240
171 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.