CVE-2026-88155

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Microsoft Office SharePoint

Publication date: 2026-10-13

Last updated on: 2026-10-14

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-88155

EUVD

EUVD-2026-99729

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sharepoint_server	to 16.0.20326.20190 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in Microsoft Office SharePoint. It allows an authorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Impact Analysis

An attacker could exploit this to run malicious code on your SharePoint server, potentially leading to data breaches, unauthorized access, or system compromise. It requires an attacker to already have authorization, but the impact is severe due to remote code execution.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy). Organizations may face fines or penalties if exploited due to inadequate security measures.

Mitigation Strategies

Apply the latest security updates from Microsoft for SharePoint Server as soon as possible to patch the heap-based buffer overflow vulnerability.

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