Executive brief
Microsoft Excel, a widely used spreadsheet application, contains a security vulnerability that could allow unauthorized access to sensitive information. An attacker could exploit this by tricking a user into opening a specially crafted file, potentially leading to the disclosure of private data from the computer's memory. While the risk of a full system takeover is low, it represents a breach of data confidentiality.
Technical details
An out-of-bounds read vulnerability (CWE-125) exists in Microsoft Office Excel. The flaw is triggered when the application reads data past the end of the intended buffer while processing a malformed file. An attacker can exploit this by convincing a user to open a malicious Excel document. Successful exploitation allows the attacker to disclose sensitive information from the process memory, though it does not inherently allow for code execution or data modification. The CVSS vector (AV:L/AC:L/PR:N/UI:R) indicates a local attack vector requiring user interaction.
Affected products
- Microsoft Excel
Timeline
- 2026-06-09: disclosed: Initial publication of the CVE record.
- 2026-06-09: advisory: Microsoft released the security advisory and update guide.