Description
Improper input validation in Microsoft Office PowerPoint 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 arises from improper input validation in Microsoft Office PowerPoint, enabling an unauthorized local attacker to read sensitive data that should otherwise remain confidential. The weakness allows disclosure of information from the host system, potentially revealing user data or configuration details stored on the device. The exploit does not provide remote code execution but can compromise privacy and contextual integrity of the user’s environment.

Affected Systems

Affected Microsoft products include Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac, and the long‑term servicing channel releases of Office 2021 and 2024, both on Windows and Mac. The CVE listing does not specify granular version fall‑throughs, so any installation of these editions that has not been updated may be vulnerable.

Risk and Exploitability

The CVSS score of 5.5 indicates a moderate severity, and the EPSS score of less than 1% points to a low probability of exploitation in the wild. The vulnerability is not present in CISA’s KEV catalog, suggesting no known widespread attacks. Based on the description, the likely attack vector is local, implying that the attacker must have ongoing access to the target machine, possibly through a shared drive or removable media that carries a malicious PowerPoint file.

Generated by OpenCVE AI on August 12, 2026 at 19:33 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Install the latest Office security updates that address the improper input validation flaw
  • Configure Office to block or quarantine PowerPoint files that lack valid digital signatures before opening
  • Enforce least privilege by limiting user accounts that can open PowerPoint files, and disable PowerPoint features that auto‑load external content

Generated by OpenCVE AI on August 12, 2026 at 19:33 UTC.

Tracking

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Advisories

No advisories yet.

History

Fri, 14 Aug 2026 13:30:00 +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

Tue, 11 Aug 2026 22:30:00 +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 Improper input validation in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information locally.
Title Powerpoint 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-20
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': 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 Microsoft 365 Office 2019 Office 2021 Office 2024 Office 365 Office Macos 2021 Office Macos 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-08-31T20:06:10.242Z

Reserved: 2026-08-04T00:01:20.933Z

Link: CVE-2026-70320

cve-icon Vulnrichment

Updated: 2026-08-11T21:03:09.323Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-11T17:19:09.633

Modified: 2026-08-14T13:10:35.890

Link: CVE-2026-70320

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T00:45:02Z

Weaknesses
  • CWE-20

    Improper Input Validation