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Findings

Vulnerability · CVE-2026-50387

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

Published Jul 14, 2026 · corrected/updated Oct 14, 2026 · microsoft 365 copilot · evidence confidence high

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

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-50387 is a high public vulnerability record for microsoft 365 copilot. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether microsoft 365 copilot is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: microsoft/365 copilot; microsoft/microsoft 365; microsoft/office 2021; microsoft/office 2024. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.8, EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-121. Sources contributing to this record: cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Technology hubs

Windows

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.

Affected

  • 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

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