PT-2026-24319 · Microsoft · Office Excel

Published 2026-03-10 · Updated 2026-04-07 · CVE-2026-26109

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

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

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

Description An out-of-bounds read issue exists in Microsoft Office Excel. This can allow an unauthorized attacker to execute code locally.

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

RCE

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

BDU:2026-03046

CVE-2026-26109

Affected Products

Office Excel

References · 10

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26109 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-26109 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/729783 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-26109 · Security Note
• https://bdu.fstec.ru/vul/2026-03046 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-26109 · Security Note
• https://twitter.com/TheHackerWire/status/2031460297677148419 · Twitter Post
• https://twitter.com/CVEnew/status/2033361118580683142 · Twitter Post
• https://t.me/avleonovcom/1637 · Telegram Post
• https://twitter.com/RedHornet_Intel/status/2041627048695812441 · Twitter Post