CVE-2026-88203Network attack vectorHinoki check available

Information disclosure via untrusted pointer dereference

Published Oct 13, 2026 · Updated Oct 13, 2026

Untrusted pointer dereference in Microsoft Office PowerPoint allows remote attackers to disclose information over a network. The published record does not identify the affected function, input format, or information exposed. User interaction is required in affected Windows installations of Office LTSC 2021, Office LTSC 2024, or Microsoft 365 Apps for enterprise; the reported impact is disclosure rather than code execution or service interruption.

CVSS severity6.5
Medium
EPSS probability0.83%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Untrusted pointer dereference in Microsoft Office PowerPoint allows remote attackers to disclose information over a network. The published record does not identify the affected function, input format, or information exposed. User interaction is required in affected Windows installations of Office LTSC 2021, Office LTSC 2024, or Microsoft 365 Apps for enterprise; the reported impact is disclosure rather than code execution or service interruption.

The record

CVE
CVE-2026-88203
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Microsoft Office LTSC 2021
Classifications
CWE-822
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.1 <16.0.14334.20974

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft Corporation · Microsoft Office LTSC 2021version=16.0.1 <16.0.14334.20974
Microsoft Corporation · Microsoft Office LTSC 2024version=16.0.0 <16.0.17932.21056
Microsoft Corporation · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

6.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-822Untrusted Pointer Dereference

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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