Description
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
Published: 2026-09-08
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Information Disclosure
Action: Patch Now
AI Analysis

Impact

The vulnerability manifests as an out-of-bounds read in Microsoft Office Word, enabling an unauthorized attacker to read memory contents that are not intended to be accessible. This flaw allows the leaking of confidential data over a network, thereby compromising the confidentiality of the affected system.

Affected Systems

Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024, and Word 2016 are all impacted. The affected range covers both Windows and macOS editions from 2016 through 2024, but specific patch-level details are not provided.

Risk and Exploitability

The CVSS score of 6.5 indicates moderate severity. The EPSS score is not available, and the vulnerability is not listed in the CISA KEV catalog, so the exact likelihood of exploitation remains uncertain. Because the description notes the possibility of disclosing information over a network, the likely attack vector involves sending a crafted document or exploiting a remote feature to trigger the out-of-bounds read. Once exploited, the attacker can read protected memory areas, potentially exposing sensitive user data. Despite the moderate CVSS rating, the theoretical nature of the exploit has yet to be publicly demonstrated, though it should be treated with caution.

Generated by OpenCVE AI on September 9, 2026 at 02:51 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Install the latest Microsoft Office security update that addresses the out-of-bounds read flaw.
  • Configure Office to block or warn about opening documents from untrusted network locations.
  • Disable macro execution or enforce a strict macro security policy until a vendor fix is available.

Generated by OpenCVE AI on September 9, 2026 at 02:51 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Tue, 08 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft microsoft 365
Microsoft word
CPEs cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
Vendors & Products Microsoft microsoft 365
Microsoft word

Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
Title Microsoft Office Word Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Microsoft office 365
Microsoft office Macos 2021
Microsoft office Macos 2024
Microsoft word 2016
Weaknesses CWE-125
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_365:*:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_macos_2021:*:*:*:*:*:long_term_servicing_channel:*:*
cpe:2.3:a:microsoft:office_macos_2024:*:*:*:*:*:long_term_servicing_channel:*:*
cpe:2.3:a:microsoft:word_2016:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Microsoft office 365
Microsoft office Macos 2021
Microsoft office Macos 2024
Microsoft word 2016
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft 365 Apps Microsoft 365 Office 2019 Office 2021 Office 2024 Office 365 Office Macos 2021 Office Macos 2024 Word Word 2016
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:38:33.739Z

Reserved: 2026-08-25T18:37:59.829Z

Link: CVE-2026-80090

cve-icon Vulnrichment

Updated: 2026-09-08T19:59:44.898Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:20:51.540

Modified: 2026-09-17T20:18:35.927

Link: CVE-2026-80090

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-13T12:45:05Z

Weaknesses