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6.5

Excel may expose data to attackers

CVE-2026-88192 · published 22 days ago
Summary

Microsoft Excel on Windows and macOS can let a remote attacker read information they shouldn't see. This could happen when a specially crafted file is opened, letting data be sent out over the network. Apply the latest Microsoft updates for Excel as soon as possible to stop this from being possible.

What to do
  • Update microsoft microsoft office ltsc 2021 to version 16.0.14334.20974 or later.
  • Update microsoft microsoft office ltsc 2024 to version 16.0.17932.21056 or later.
Affected software
VendorProductAffected versions
microsoft microsoft 365 apps for enterprise 16.0.1
microsoft microsoft office 365 for mac < publication
< 16.114.26101123
microsoft microsoft office ltsc 2021 < 16.0.14334.20974
microsoft microsoft office ltsc 2024 < 16.0.17932.21056
microsoft microsoft office ltsc for mac 2021 < publication
< 16.114.26101123
microsoft microsoft office ltsc for mac 2024 < publication
< 16.114.26101123
microsoft 365_apps All versions
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
microsoft microsoft_365 All versions
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
microsoft office_2021 All versions
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
microsoft office_2024 All versions
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
Original advisory text
Microsoft Office Excel Information Disclosure Vulnerability
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
6.5 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-125Out-of-bounds Read
Timeline
Published13 Oct 2026
Updated4 Nov 2026
First seen13 Oct 2026
Sources
CVE-2026-88192 · NVD
CVE-2026-88192 · MITRE
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