PatchTheCEVCVE-2026-62775: Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized att
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Routine
MEDIUM 5.5WATCHLISTUPGRADE
CVE-2026-62775 is a medium-severity flaw (CVSS 5.5) affecting windows 11 26h1. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 73%) |
| CISA exploited list | No |
| Weakness | CWE-863 |
| Published | 2026-08-11 |
| Last modified | 2026-10-23 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
microsoft windows 11 26h1 UPGRADE
Affected: < 10.0.28000.2704
Fixed in: 10.0.28000.2704
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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