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8.8High

CVE-2026-78439Microsoft Office Graphics Component Remote Code Execution Vulnerability

Microsoft Microsoft Office 365 for Mac; Microsoft Microsoft Office for Android; Microsoft Microsoft Office LTSC for Mac 2021; Microsoft Microsoft Office LTSC f… Published: (2 months ago)

Description

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Weakness (CWE): CWE-121

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
Microsoft Microsoft Office 365 for Mac 1.0.0 – < 16.113.26091433
Microsoft Microsoft Office for Android 16.0.1 – < 16.0.20430.20000
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1 – < 16.113.26091433
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0 – < 16.113.26091433
microsoft office 16.0.1 – < 16.0.20430.20000
microsoft office 365 1.0.0 – < 16.113.26091433
microsoft office macos 2021 16.0.1 – < 16.113.26091433
microsoft office macos 2024 16.0.0 – < 16.113.26091433

References and patches

Recent CVEs in the same product — Microsoft Office / 365 Apps

8.8High
CVE-2026-120003

Microsoft Office Remote Code Execution Vulnerability

Microsoft Microsoft 365 Apps for Enterprise; Microsoft Microsoft Office 365 for Mac; Microsoft Microsoft Office LTSC 2021; Microsoft Microsoft Office LTSC 2024

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.

6.5Medium
CVE-2026-119999

Microsoft Office Excel Information Disclosure Vulnerability

Microsoft Microsoft 365 Apps for Enterprise; Microsoft Microsoft Office 365 for Mac; Microsoft Microsoft Office LTSC 2021; Microsoft Microsoft Office LTSC 2024

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

6.5Medium
CVE-2026-119998

Microsoft Office Security Feature Bypass Vulnerability

Microsoft Microsoft 365 Apps for Enterprise; Microsoft Microsoft Office LTSC 2021; Microsoft Microsoft Office LTSC 2024

Product ui does not warn user of unsafe actions in Microsoft Office allows an unauthorized attacker to bypass a security feature over a network.