CVE-2025-62556: Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVE-2025-62556 · Severity: high · CVSS 7.8 · Published 2025-12-09

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Technologies: Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Office Online Server. Vendors: Microsoft.

Quick answers

Is CVE-2025-62556 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-62556 being exploited in the wild.
How severe is CVE-2025-62556?
High severity, with a CVSS score of 7.8, published 9 December 2025.
Which products and versions are affected?
Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office Long Term Servicing Channel and 1 more. The advisory does not name versions.
Is there a fix for CVE-2025-62556?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-62556?
Check whether you run Microsoft 365 Apps, Microsoft Excel, Microsoft Office or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft 365 Apps
  • Microsoft Excel
  • Microsoft Office
  • Microsoft Office Long Term Servicing Channel
  • Microsoft Office Online Server

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