What’s Vulnerable › Vulnerabilities
CVE-2026-78439: Microsoft Office Graphics Component Remote Code Execution Vulnerability
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-08 · updated 2026-09-17
- Weakness: CWE-121
Description
Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
Affected products
- Microsoft Office 365 for Mac: from 1.0.0 before 16.113.26091433 — fixed in 16.113.26091433
- Microsoft Office for Android: from 16.0.1 before 16.0.20430.20000 — fixed in 16.0.20430.20000
- Microsoft Office LTSC for Mac 2024: from 16.0.0 before 16.113.26091433 — fixed in 16.113.26091433
- Microsoft Office LTSC for Mac 2021: from 16.0.1 before 16.113.26091433 — fixed in 16.113.26091433
How to fix
Upgrade to a fixed version: Microsoft Office 365 for Mac 16.113.26091433; Microsoft Office for Android 16.0.20430.20000; Microsoft Office LTSC for Mac 2024 16.113.26091433; Microsoft Office LTSC for Mac 2021 16.113.26091433. Check the vendor advisory for mitigations.
References
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