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CVE-2026-69339: Exposure of sensitive system information to an unauthorized control sphere in Windows MIDI Service Module allo

35
Routine
MEDIUM 5.5WATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2026-69339 is a medium-severity flaw (CVSS 5.5) affecting windows 11 24h2, windows 11 25h2, windows 11 26h1. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Exposure of sensitive system information to an unauthorized control sphere in Windows MIDI Service Module allows an authorized attacker to disclose information locally.

Why this priority

  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score5.5 (Medium)
Attack vectorLocal
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.5% (top 59%)
CISA exploited listNo
WeaknessCWE-497
Published2026-09-08
Last modified2026-09-17
Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Share: LinkedIn · X · Reddit

Last updated 2026-09-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

microsoft windows 11 24h2 UPGRADE
Affected: < 10.0.26100.9445
Fixed in: 10.0.26100.9445
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 11 25h2 UPGRADE
Affected: < 10.0.26200.9445
Fixed in: 10.0.26200.9445
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 11 26h1 UPGRADE
Affected: < 10.0.28000.2954
Fixed in: 10.0.28000.2954
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-69339?

windows 11 24h2: upgrade to 10.0.26100.9445; windows 11 25h2: upgrade to 10.0.26200.9445; windows 11 26h1: upgrade to 10.0.28000.2954. Exact commands for each OS are on this page.

Is CVE-2026-69339 being exploited?

CVE-2026-69339 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-69339 affect?

CVE-2026-69339 affects windows 11 24h2, windows 11 25h2, windows 11 26h1. Severity is medium (CVSS 5.5). Exposure of sensitive system information to an unauthorized control sphere in Windows MIDI Service Module allows an authorized attacker to disclose information locally.

How urgent is CVE-2026-69339?

Priority 35/100. On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

References

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