CVE tracker / CVE-2026-69617

CVE-2026-69617

CVE-2026-69617 is the Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.0. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.

Risk summary

HighElevation of Privilege
7.0
CVSS v3 base
0.3%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Out-of-bounds read in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.”

How to fix it

Microsoft lists 4 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-125: Out-of-bounds Read
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
September 8, 2026
Last revised
September 8, 2026

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.