CVE-2026-70264
Microsoft Defender Information Disclosure Vulnerability
Microsoft Windows DefenderOperating systems
CVSS
5.5MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.43%Chance of exploitation activity in the next 30 days, higher than 36% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 1.1.26090.9Windows DefenderCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Vendor and government advisories 1
Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.
Reports 1
1 outlet mention it. Reports are not confirmation; each links to its source.
Description
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to disclose information locally.
Text from CVE List
Affected versions 1
- Windows Defenderaffected: all versions before 1.1.26090.9CVE List