cve-2026-45455

CVE-2026-45455 is a Microsoft Excel information disclosure vulnerability disclosed in Microsoft's June 2026 Security Update Guide. Its CVSS impact metrics show limited confidentiality loss with no direct integrity or availability impact. While less dramatic than remote code execution, this vulnerability matters because Excel is a trusted file format in business environments. Even limited information disclosure can provide attackers with enough sensitive data to progress toward compromise. Discussions on WindowsForum emphasize not dismissing this CVE due to its lower severity rating, as the leaked information may be valuable in targeted attacks. Users are advised to apply the relevant security update to mitigate the risk.