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Microsoft 365 Apps For Enterprise CVE-2026-55123

| EUVDEUVD-2026-44220 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-07-14 microsoft GHSA-p5vp-2g4x-94qp
7.8
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 19:20 vuln.today
CVE Published
Jul 14, 2026 - 17:09 nvd
HIGH 7.8

DescriptionCVE.org

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

AnalysisAI

Local code execution in Microsoft Office PowerPoint (including Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, and their macOS variants) arises from a heap-based buffer overflow triggered when a victim opens a maliciously crafted presentation file. Successful exploitation runs attacker-controlled code with the privileges of the current user, yielding full confidentiality, integrity, and availability impact. …

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Recommended ActionAI

Within 24 hours, inventory all systems running affected Microsoft Office versions (Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024) and communicate risks to users, advising against opening presentations from untrusted sources until patching is complete. …

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CVE-2026-55123 vulnerability details – vuln.today

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