CVE tracker / CVE-2026-21222

CVE-2026-21222

CVE-2026-21222 is the Windows Kernel Information Disclosure Vulnerability. Microsoft rates it Important, CVSS 5.5. It is not in CISA's Known Exploited Vulnerabilities catalog. Published February 10, 2026.

Risk summary

MediumInformation Disclosure
5.5
CVSS v3 base
0.6%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally.”

How to fix it

Microsoft lists 25 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-532: Insertion of Sensitive Information into Log File
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
February 10, 2026
Last revised
February 10, 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.