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CVE-2026-55043

Microsoft PowerPoint Remote Code Execution Vulnerability

HIGH
7.8
CVSS Score
Published: July 14, 2026 at 05:09 PM UTC
Updated: October 8, 2026 at 06:17 PM UTC
7 products affected across 1 vendor365 AppsOffice 2021Office 2019

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Severity
HIGH7.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Heap-based buffer overflow in Microsoft Office PowerPoint allows an unauthorized attacker to execute code locally.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

365 Apps· Microsoft
95%
1.0.0 ≤ v < 16.111.2607121516.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases1.0.016.0.1
Affected range stops below 16.111.26071215, so it looks safe — our inference, not a vendor statement
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Microsoft 365· Microsoft
95%
All versions
Office 2019· Microsoft
95%
19.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases19.0.0
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 2021· Microsoft
95%
16.0.1 ≤ v < 16.111.2607121516.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases16.0.1
Affected range stops below 16.111.26071215, so it looks safe — our inference, not a vendor statement
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 2024· Microsoft
95%
16.0.0 ≤ v < 16.111.2607121516.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases16.0.0
Affected range stops below 16.111.26071215, so it looks safe — our inference, not a vendor statement
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 365· Microsoft
95%
1.0.0 ≤ v < 16.111.26071215
Affected range stops below 16.111.26071215, so it looks safe — our inference, not a vendor statement
PowerPoint· Microsoft
95%
16.0.0 ≤ v < 16.0.5561.100016.0.02016
Affected range stops below 16.0.5561.1000, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55043

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-122CWE-190

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