ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-50387

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

Published Jul 14, 2026 · catalog updated Oct 14, 2026 · 365 copilot

Check if you run it

No confirmed exploitation is on record for CVE-2026-50387. EPSS is 0.33%. Act only if a listed version of 365 copilot is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.33%
Remediation
Advisory link
Affected products
cpe microsoft/365 copilot · cpe microsoft/microsoft 365 · cpe microsoft/office 2021 · cpe microsoft/office 2024 · cpe microsoft/windows 10 1607 · cpe microsoft/windows 10 1809

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/365 copilotversion unspecified
  • cpe microsoft/microsoft 365version unspecified
  • cpe microsoft/office 2021version unspecified
  • cpe microsoft/office 2024version unspecified
  • cpe microsoft/windows 10 1607version unspecified
  • cpe microsoft/windows 10 1809version unspecified

How to fix CVE-2026-50387

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-50387. EPSS is 0.33%. Act only if a listed version of 365 copilot is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow. EPSS 0.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 14, 2026 · NIST NVD

    Detected

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

  2. Oct 14, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-50387

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-50387

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-50387

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.