CVE-2026-50387: microsoft microsoft_365 Stack-based Buffer Overflow

Vulnerability summary

CVE-2026-50387 is a high (CVSS 7.8) Stack-based Buffer Overflow vulnerability in microsoft microsoft_365. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 25.2% of scored vulnerabilities.

Timeline

1. 14-07-2026
   PublishedVulnerability first disclosed.
2. 08-10-2026
   Last modifiedVulnerability information updated.

Description

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

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).