8.8
High
CVE-2026-78517 Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network
Description
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft 365 Apps for Enterprise 16.0 | 16.0.1 → < 16.0.20326.20138 | 16.0.20326.20138 |
| Microsoft Office 2019 16.0 | earliest → < 16.0.10417.20207 | 16.0.10417.20207 |
| Microsoft Office 365 for Mac 1.0 | 1.0.0 → < 16.113.26091433 | 16.113.26091433 |
| Microsoft Office LTSC 2021 16.0 | 16.0.1 → < 16.0.14334.20906 | 16.0.14334.20906 |
| Microsoft Office LTSC 2024 16.0 | 16.0.0 → < 16.0.17932.20976 | 16.0.17932.20976 |
| Microsoft Office LTSC for Mac 2021 16.0 | 16.0.1 → < 16.113.26091433 | 16.113.26091433 |
| Microsoft Office LTSC for Mac 2024 16.0 | 16.0.0 → < 16.113.26091433 | 16.113.26091433 |
| Microsoft Word 2016 16.0 | 16.0.1 → < 16.0.5569.1000 | 16.0.5569.1000 |
References
- Microsoft Office Word Remote Code Execution Vulnerability msrc.microsoft.com
Timeline
- Published
- Last modified
Other CVEs of Microsoft 365 Apps for Enterprise
The 931 CVEs of Microsoft 365 Apps for Enterprise →
CVE-2026-108454
Buffer over-read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network
6.5
Medium
CVE-2026-108455
Out-of-bounds read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network
6.5
Medium
CVE-2026-108453
Out-of-bounds read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network
6.5
Medium
CVE-2026-108450
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network
8.8
High