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: Apply Patch
AI Analysis

Impact

An out‑of‑bounds read bug in Microsoft Office Word permits an attacker to read memory beyond the allocated boundaries, revealing confidential data. This flaw is classified as CWE‑125 and carries a CVSS score of 6.5, indicating a moderate severity that can compromise the confidentiality of document contents and application memory.

Affected Systems

Impact covers Microsoft 365 Apps for Enterprise, Microsoft Office 2016, Microsoft Office 2019, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, Microsoft Office LTSC for Mac 2021, and Microsoft Office LTSC for Mac 2024. Any version of these products is affected, with no further sub‑release details provided.

Risk and Exploitability

The CVSS score of 6.5 highlights a moderate risk of exploitation. The description indicates that the read can be triggered over a network, so the likely attack vector is remote network‑based. The vulnerability is not listed in the CISA KEV catalog, implying limited known exploitation, yet any machine that runs the affected Office versions and receives untrusted documents could be at risk if an attacker controls the network traffic.

Generated by OpenCVE AI on September 9, 2026 at 02:54 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Download and install the latest security update for Microsoft Office that fixes CVE‑2026‑80088 from the Microsoft Security Response Center update guide.
  • Temporarily isolate impacted systems from external network connectivity until the patch is applied to reduce risk of data disclosure.
  • After patching, review documents that were opened from untrusted sources for any residual sensitive information that might have been exposed during the vulnerability window.

Generated by OpenCVE AI on September 9, 2026 at 02:54 UTC.

Tracking

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Advisories

No advisories yet.

History

Sun, 13 Sep 2026 08:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft microsoft 365 Apps For Enterprise
Microsoft microsoft Office 2016
Microsoft microsoft Office 2019
Microsoft microsoft Office 365 For Mac
Microsoft microsoft Office Ltsc 2021
Microsoft microsoft Office Ltsc 2024
Microsoft microsoft Office Ltsc For Mac 2021
Microsoft microsoft Office Ltsc For Mac 2024
Vendors & Products Microsoft microsoft 365 Apps For Enterprise
Microsoft microsoft Office 2016
Microsoft microsoft Office 2019
Microsoft microsoft Office 365 For Mac
Microsoft microsoft Office Ltsc 2021
Microsoft microsoft Office Ltsc 2024
Microsoft microsoft Office Ltsc For Mac 2021
Microsoft microsoft Office Ltsc For Mac 2024

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
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_2016:-:*:*:*:-:*:x64:*
cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*
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:-:*
Vendors & Products Microsoft microsoft 365

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 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Microsoft office 365
Microsoft office Macos 2021
Microsoft office Macos 2024
Weaknesses CWE-125
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:office_2016:*:*:*:*:*:*:x86:*
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:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft office 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Microsoft office 365
Microsoft office Macos 2021
Microsoft office Macos 2024
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 Microsoft 365 Apps For Enterprise Microsoft Office 2016 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 Office 2016 Office 2019 Office 2021 Office 2024 Office 365 Office Macos 2021 Office Macos 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:38:32.084Z

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

Link: CVE-2026-80088

cve-icon Vulnrichment

Updated: 2026-09-08T20:00:20.005Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:20:51.280

Modified: 2026-09-17T20:18:35.657

Link: CVE-2026-80088

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-13T07:45:15Z

Weaknesses