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Vulnerability record · CVE-2026-50387 · published 14 July 2026

CVE-2026-50387: Microsoft 365 copilot stack-based buffer overflow vulnerability

Microsoft · 365 Copilot

Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.

7.8 CVSS 3.1 High EPSS 0.33% · top 75.9% CWE-121 · Stack-based buffer overflow
7.8CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
16Affected product versions listed by NVD
1References
22 Jul 2026Last modified by NVD

Description

Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

16 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50387 PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-50387), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.