CVE-2026-88109

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability

Published Oct 13, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Microsoft microsoft 365 Apps For Enterprise
Microsoft microsoft Office Ltsc 2021
Microsoft microsoft Office Ltsc 2024
Vendors & Products Microsoft microsoft 365 Apps For Enterprise
Microsoft microsoft Office Ltsc 2021
Microsoft microsoft Office Ltsc 2024
Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Title Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
Microsoft office 2021
Microsoft office 2024
Weaknesses CWE-416
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft office 2021
Microsoft office 2024
References
Metrics cvssV3_1

{'score': 7.8, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 8:43 PM
Reserved
Sep 9, 2026, 9:51 PM
Status
Analyzed
Published
Oct 13, 2026, 7:21 PM
Modified
Oct 15, 2026, 5:32 PM