CVE-2026-45463
Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45463 is a high vulnerability (CVSS 8.4) in Microsoft 365 Apps, published June 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 30th percentile. No source names a fixed version.
- Severity
- 8.4 HighCVSS 3.1, CVE List
- Exploit chance
- 0.36%EPSS, 30th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Affected products
- microsoft 365 apps
- microsoft 365 copilot
- microsoft 365 apps for enterprise
- microsoft office 2016
- microsoft office 2019
- microsoft office 365 for mac
- microsoft office for android
- microsoft office ltsc 2021
- microsoft office ltsc 2024
- microsoft office ltsc for mac 2021
- microsoft office ltsc for mac 2024
- microsoft 365
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What each source reports
CVE List Score used
Microsoft Office Remote Code Execution Vulnerability
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
- Record
CVE-2026-45463- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-191, CWE-121
- Updated
- 2026-11-11
EUVDEUVD-2026-35543
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
- Record
EUVD-2026-35543- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-11
GitHub AdvisoriesGHSA-wqhv-6ff2-ww7r
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code...
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
- Record
GHSA-wqhv-6ff2-ww7r- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-121
- Updated
- 2026-11-02
NVD
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
- Record
CVE-2026-45463- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-121, CWE-191
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.