Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability (Microsoft Windows 11 version 26H1)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.36 % · percentile 30 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.
Weaknesses (CWE)
- CWE-59 — Improper Link Resolution Before File Access
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | NVD · secure@microsoft.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-56603
- GCVE · GCVE-0-2026-72971
CERT-FR advisories
- CERTFR-2026-AVI-1001 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*< 10.0.28000.2704cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*< 10.0.28000.2704
Affected products
| Product | Versions |
|---|---|
| Microsoft · Windows 11 version 26H1 | affected 10.0.28000.0 < 10.0.28000.2704 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |