Description
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Published: 2026-08-11
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability is an out‑of‑bounds read in Microsoft Office that permits an unauthorized local attacker to read protected memory contents, resulting in disclosure of sensitive data. This weakness is identified as CWE‑125 and represents a classic memory‑unsafe read that leaks information but does not provide code execution or denial of service.

Affected Systems

Affected products include Microsoft 365 Apps for Enterprise, Microsoft Office 2016, Microsoft Office 2019, Microsoft Office LTSC 2021, and Microsoft Office LTSC 2024. Version details are not specified in the current data.

Risk and Exploitability

The CVSS score of 5.5 indicates moderate severity. The EPSS score of less than 1% suggests a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. The flaw requires local access; the attack vector is inferred to involve a local user interacting with Office applications or files. Remote exploitation or privilege escalation is not supported by the supplied data.

Generated by OpenCVE AI on August 12, 2026 at 16:40 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Check for and apply any Microsoft security or cumulative updates that address this vulnerability.
  • Restart Office applications so updated binaries load.
  • Limit local account privileges and disable unnecessary add‑ins that run with elevated rights.
  • Monitor Microsoft security advisories for any patches related to CVE-2026-63529.

Generated by OpenCVE AI on August 12, 2026 at 16:40 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Fri, 14 Aug 2026 13:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
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_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*

Tue, 11 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 11 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
Description Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Title Microsoft Office Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
Microsoft office 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 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:*:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft office 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}


Subscriptions

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

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-08-31T20:07:17.585Z

Reserved: 2026-07-16T22:05:22.741Z

Link: CVE-2026-63529

cve-icon Vulnrichment

Updated: 2026-08-11T18:59:50.636Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-11T17:18:49.787

Modified: 2026-08-14T13:39:34.417

Link: CVE-2026-63529

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T03:15:11Z

Weaknesses