CVE-2026-45459: Microsoft Excel Security Feature Bypass Vulnerability
Microsoft Excel Security Feature Bypass Vulnerability
Other sources
Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.110.26061317 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45459?
The severity of CVE-2026-45459 is rated low with a score of 3.3.
How do I fix CVE-2026-45459?
To mitigate CVE-2026-45459, update Microsoft Excel to the latest version provided by Microsoft.
Who is affected by CVE-2026-45459?
CVE-2026-45459 affects users of Microsoft 365 Apps, Microsoft Office 2024, Microsoft Office LTSC 2024, and related Microsoft Office applications.
What type of vulnerability is CVE-2026-45459?
CVE-2026-45459 is a security feature bypass vulnerability that allows unauthorized access to security features locally.
What impact does CVE-2026-45459 have?
CVE-2026-45459 can potentially allow attackers to bypass certain security mechanisms in Microsoft Excel.