Vulnerability · Published Aug 11, 2026 · Assigned by microsoft
CVE-2026-70318Microsoft Excel Information Disclosure Vulnerability
Medium 5.5
In plain English
A medium-severity improper input validation in Microsoft 365 Apps for Enterprise from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.5%top 54.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 2019 | 19.0.0 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 365 for Mac | 1.0.0 – before 16.112.26081010 |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 – before 16.112.26081010 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 – before 16.112.26081010 |
| Microsoft | Microsoft Word 2016 | 16.0.1 – before 16.0.5565.1000 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
References
- Microsoft Excel Information Disclosure Vulnerability vendor-advisory, patch