CVE-2026-20950 is a use-after-free vulnerability in Microsoft Office Excel, impacting various Microsoft Office products including Microsoft 365 Apps and Office Online Server. This flaw allows an unauthenticated attacker to execute arbitrary code locally if a user opens a specially crafted Excel file. With a CVSS score of 7.8 (High), it presents a significant risk due to its high impact on confidentiality, integrity, and availability, though user interaction is required for exploitation. While there is no evidence of active exploitation (not in KEV or Hot List) and no public exploit code available (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered notable community discussion and media coverage, indicating awareness within the security community.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* | ||
2016CPE matchmatch criteria | cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:* | ||
2016CPE matchmatch criteria | cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:* | ||
2019CPE matchmatch criteria | cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.