CVE-2026-70323: Microsoft Office Information Disclosure Vulnerability
Overview
- Severity
- Medium (CVSS 5.5)
- CVSS 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
- Category
- Information Disclosure
- Exploit Status
- Not Exploited
- Exploitation Likelihood
- Less Likely
- Patch Tuesday
- 2026-Aug
- Released
- 2026-08-11
Description
Improper input validation in Microsoft Office allows an unauthorized attacker to disclose information locally.
FAQ
What type of information could be disclosed by this vulnerability?
An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.
Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.
Affected Products (11)
Microsoft Office
- Microsoft Office 2019 for 32-bit editions
- Microsoft Office 2019 for 64-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft Office LTSC 2021 for 64-bit editions
- Microsoft Office LTSC 2021 for 32-bit editions
- Microsoft Office LTSC 2024 for 64-bit editions
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft Office 365 for Mac
- Microsoft Office LTSC for Mac 2021
- Microsoft Office LTSC for Mac 2024
Security Updates (2)
Acknowledgments
sangnt (@gnas0x0018) with Viettel Cyber Security
Revision History
- 2026-08-11: Information published.