Description
Out-of-bounds read in Microsoft Office 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
AI Analysis

Impact

The vulnerability is an out‑of‑bounds read (CWE‑125) that permits an attacker to read protected memory. Successful exploitation could lead to the disclosure of sensitive information over the network, compromising confidentiality. The description indicates the defect arises during document processing, where memory bounds are not correctly enforced, allowing unauthorized memory access.

Affected Systems

Affected products include 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, and Microsoft Office LTSC for Mac 2024. All licensed versions of these products may be affected; applying the latest security updates is required.

Risk and Exploitability

The CVSS score of 6.5 reflects a moderate level of impact. The EPSS score is not available and no external exploitation reports are known, indicating a low to moderate immediate risk. The vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is remote, requiring a user to open or preview a malicious Office document to trigger the out‑of‑bounds read and exfiltrate data over the network.

Generated by OpenCVE AI on September 9, 2026 at 20:28 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Microsoft Office security update as distributed through Microsoft Update or the Office update workflow.
  • Configure Office to block or restrict processing of potentially unsafe content, such as disabling automatic execution of macros in unknown files or prompting for permission before loading external data.
  • Deploy endpoint protection and network monitoring tools to detect anomalous memory access patterns or data exfiltration attempts that may indicate exploitation of this memory read flaw.

Generated by OpenCVE AI on September 9, 2026 at 20:28 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 10 Sep 2026 15:00:00 +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_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

Thu, 10 Sep 2026 04:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft microsoft 365 Apps For Enterprise
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 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 17:30:00 +0000

Type Values Removed Values Added
Description Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information over a network.
Title Microsoft Office 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
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:*:*
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
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 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 2019 Office 2021 Office 2024 Office 365 Office Macos 2021 Office Macos 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:38:34.769Z

Reserved: 2026-08-25T18:37:59.828Z

Link: CVE-2026-80082

cve-icon Vulnrichment

Updated: 2026-09-08T19:59:30.701Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:20:50.487

Modified: 2026-09-17T20:18:34.960

Link: CVE-2026-80082

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T04:30:06Z

Weaknesses