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High 7.8Published May 12, 2026
CVE-2026-40418Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
Updated under an hour ago ()
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It affects Microsoft 365 Apps for Enterprise and 6 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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Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-416
- 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
- Modified
- Record last updated
- Aug 10, 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 2019 microsoft:office_2019 (from the name) | from 19.0.0 before https://aka.ms/OfficeSecurityReleases | 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 365_apps microsoft:365_apps | all versions; all versions | NVD |
microsoft office microsoft:office | 2019; 2019 | NVD |
microsoft office_long_term_servicing_channel microsoft:office_long_term_servicing_channel | 2021; 2021; 2024; 2024 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40418vendor-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.