PT-2026-58213 · Microsoft · Office Excel

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-50678

Positive Technologies (AI Summary)

CVSS v3.1

6.6

Medium

Base vector

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

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

Description A heap-based buffer overflow occurs when a program writes more data to a heap memory block than it can hold, potentially leading to memory corruption. This issue allows an unauthorized attacker to disclose information locally or cause the application to crash by inducing the user to open a malicious spreadsheet.

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

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-50678

Affected Products

Office Excel

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-50678 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50678 · Vendor Advisory
• https://twitter.com/windowsforum/status/2077178870978007121 · Twitter Post