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The Update Bureau
Security

KB5002884: all 58 vulnerabilities

Cumulative update for Office Online Server, version OOS, July 2026. The update page explains it and lists only the exploited, publicly disclosed and critical vulnerabilities; here are all of them, most severe first.

Vulnerabilities fixed

58 vulnerabilities fixed
3 critical 55 important
VulnerabilitySeverityCVSS
Microsoft Excel Remote Code Execution Vulnerability
Critical 7.8
Microsoft Excel Remote Code Execution Vulnerability
Critical 7.8
Microsoft Excel Remote Code Execution Vulnerability
Critical 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 8.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Remote Code Execution Vulnerability
Important 7.8
Microsoft Excel Information Disclosure Vulnerability
Important 7.1
Microsoft Excel Information Disclosure Vulnerability
Important 6.6
Microsoft Excel Information Disclosure Vulnerability
Important 6.5
Microsoft Excel Information Disclosure Vulnerability
Important 6.5
Microsoft Excel Information Disclosure Vulnerability
Important 6.5
Microsoft Excel Information Disclosure Vulnerability
Important 6.1
Microsoft Excel Information Disclosure Vulnerability
Important 6.1
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5
Microsoft Excel Information Disclosure Vulnerability
Important 5.5