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High 7.8Published Aug 11, 2026
CVE-2026-64903Microsoft Office Remote Code Execution Vulnerability
Updated under an hour ago ()
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It affects Microsoft 365 Apps for Enterprise and 11 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-190, CWE-122
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office 2016 microsoft:office_2016 (from the name) | from 16.0.0 before 16.0.5565.1001 | CNA record |
Microsoft Microsoft Office 2019 microsoft:office_2019 (from the name) | from 19.0.0 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office 365 for Mac microsoft:office_365_for_mac (from the name) | from 1.0.0 before 16.112.26081010 | CNA record |
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office LTSC 2024 microsoft:office_ltsc_2024 (from the name) | from 16.0.0 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office LTSC for Mac 2021 microsoft:office_ltsc_for_mac_2021 (from the name) | from 16.0.1 before 16.112.26081010 | CNA record |
Microsoft Microsoft Office LTSC for Mac 2024 microsoft:office_ltsc_for_mac_2024 (from the name) | from 16.0.0 before 16.112.26081010 | CNA record |
microsoft 365_apps microsoft:365_apps | all versions; all versions | NVD |
microsoft microsoft_365 microsoft:microsoft_365 | all versions | NVD |
microsoft office_2016 microsoft:office_2016 | all versions; all versions | NVD |
microsoft office_2019 microsoft:office_2019 | all versions; all versions | NVD |
microsoft office_2021 microsoft:office_2021 | all versions; all versions; all versions | NVD |
microsoft office_2024 microsoft:office_2024 | all versions; all versions; all versions | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64903vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.