MEDIUM

CVE-2026-28388

CVSS v3

7.5

MEDIUM

EPSS Score

0.0%

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

Microsoft Security Update (CVE-2026-28388)

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
NULL Pointer Dereference When Processing a Delta CRL

Frequently asked questions

What is CVE-2026-28388?

Microsoft Security Update (CVE-2026-28388)

Is CVE-2026-28388 actively exploited?

Active exploitation of CVE-2026-28388 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-2026-28388?

CVE-2026-28388 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-2026-28388 affecting your environment?

Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.

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