PT-2026-58559 · Microsoft · Office Word+1

Published 2026-07-14 · Updated 2026-07-15 · CVE-2026-55055

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Microsoft Office Word (affected versions not specified) Microsoft SharePoint (affected versions not specified)

Description A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than the buffer is allocated to hold, potentially leading to memory corruption. This issue allows an unauthorized attacker to execute code locally or remotely via a malicious file.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-55055

Affected Products

Office Word

Sharepoint Server

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-55055 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-55055 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55055 · Vendor Advisory
• https://twitter.com/windowsforum/status/2077446416213869001 · Twitter Post