CVE-2026-28390

MEDIUM

CVSS v3

7.5

MEDIUM

EPSS Score

0.0%

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

Microsoft Security Update (CVE-2026-28390)

Technical Details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 5/7/2026
MSRC Title: Possible NULL Dereference When Processing CMS KeyTransportRecipientInfo

Frequently Asked Questions

What is CVE-2026-28390?

Microsoft Security Update (CVE-2026-28390)

Is CVE-2026-28390 actively exploited?

Active exploitation of CVE-2026-28390 has not been confirmed. The EPSS score is 0.0%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-28390?

CVE-2026-28390 has a CVSS v3 base score of 7.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is CVE-2026-28390 affecting your environment?

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