CVE-2026-78512
Microsoft Office Word Remote Code Execution Vulnerability
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Office Word Remote Code Execution Vulnerability
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-78512- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-197, CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2026-73818
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-73818- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-wmm4-h5xq-67rx
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code...
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
- Record
GHSA-wmm4-h5xq-67rx- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-78512- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-122, CWE-197
- Updated
- 2026-11-02
Affected products
- microsoft word
- microsoft 365 apps
- microsoft 365 apps for enterprise
- microsoft office 2016
- microsoft office 2019
- microsoft office 365 for mac
- microsoft office ltsc 2021
- microsoft office ltsc 2024
- microsoft office ltsc for mac 2021
- microsoft office ltsc for mac 2024
- microsoft 365
- microsoft office 2021
Show 1 moreShow less
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-78512 is a high vulnerability (CVSS 8.8) in Microsoft Word, published September 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.82%, the 57th percentile. No source names a fixed version.