Product:
Microsoft Office Excel
Summary
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally. This vulnerability can lead to significant confidentiality breaches if exploited. Users must be cautious when handling Excel files from untrusted sources.
Details
| Severity | Base Score | CVE |
|---|---|---|
| MEDIUM | 5.5 | CVE-2026-21258 |
Exploitation
To exploit this vulnerability, an attacker must have local access to the affected system and require user interaction. By manipulating input data in Excel, the attacker can trigger the improper validation process, leading to unauthorized information disclosure. It is crucial for users to be aware of the risks associated with opening files from unknown origins.
Affected Products
- Microsoft Office Excel: Vulnerable to improper input validation, allowing local information disclosure.
Mitigation
To mitigate this vulnerability, users should ensure they are using the latest version of Microsoft Office Excel and apply any available security updates. Additionally, users should avoid opening Excel files from untrusted sources and implement strict access controls to sensitive information.