CVE-2025-59240: Exposure of sensitive information to an unauthorized actor in Microsoft Office Excel allows an unauthorized attacker…

CVE-2025-59240 · Severity: medium · CVSS 5.5 · Published 2025-11-11

Exposure of sensitive information to an unauthorized actor in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

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

Quick answers

Is CVE-2025-59240 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-59240 being exploited in the wild.
How severe is CVE-2025-59240?
Medium severity, with a CVSS score of 5.5, published 11 November 2025.
Which products and versions are affected?
Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office Long Term Servicing Channel. The advisory does not name versions.
Is there a fix for CVE-2025-59240?
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-2025-59240?
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

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