CVE-2026-45460: Microsoft Office Information Disclosure Vulnerability

Overview

Severity
Medium (CVSS 4.7)
CVSS Vector
CVSS:3.1/AV:L/AC:H/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
Unlikely
Patch Tuesday
2026-Jun
Released
2026-06-09

Description

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

FAQ

Are the updates for the Microsoft Office LTSC and Microsoft 365 for Mac currently available? The security update for Microsoft Office LTSC for Mac 2021, 2024 and Microsoft 365 for Mac are not immediately available. The updates will be released as soon as possible, and when they are available, customers will be notified via a revision to this CVE information. 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. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? An attacker must send a user a malicious Office file and convince them to open it. Is the Preview Pane an attack vector for this vulnerability? Yes, the Preview Pane is an attack vector. Are the updates for the Microsoft Office for Android currently available? The security update for Microsoft Office for Android is not immediately available. The update will be released as soon as possible. When it is available, customers will be notified via a revision to this CVE information.

Affected Products (12)

Microsoft Office

  • Microsoft Office for Android
  • Microsoft Office 365 for Mac
  • Microsoft Office 2019 for 32-bit editions
  • Microsoft Office 2019 for 64-bit editions
  • Microsoft 365 Apps for Enterprise for 32-bit Systems
  • Microsoft 365 Apps for Enterprise for 64-bit Systems
  • Microsoft Office LTSC for Mac 2021
  • Microsoft Office LTSC 2021 for 64-bit editions
  • Microsoft Office LTSC 2021 for 32-bit editions
  • Microsoft Office LTSC 2024 for 32-bit editions
  • Microsoft Office LTSC 2024 for 64-bit editions
  • Microsoft Office LTSC for Mac 2024

Acknowledgments

0ccbbf129444eb66344ccafb92b00df4, <a href="https://x.com/fluddsec">FluddSec</a> with <a href="https://runiclabs.io/">RunicLabs</a>

Revision History

  • 2026-06-09: Information published.