PT-2026-2756 · Microsoft · Office Excel

Jmini + 1 · Publicado 2026-01-13 · Atualizado 2026-01-19 · CVE-2026-20957

Positive Technologies (AI Summary)

CVSS v3.1

7.8

Alta

Vetor base

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 Excel (affected versions not specified)

Description An integer underflow condition exists in Microsoft Office Excel that could allow an unauthorized attacker to execute code locally. The issue is due to an integer underflow, also known as a wrap or wraparound.

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

RCE

Integer Underflow

Heap Based Buffer Overflow

Enumeração de Fraquezas

CWE-191

CWE-122

Identificadores relacionados

BDU:2026-00401

CVE-2026-20957

Produtos afetados

Office Excel

Referências · 7

• https://twitter.com/CVEnew/status/2011142886440472883 · Publicação no Twitter
• https://twitter.com/The_SatyaDVV/status/2013126685756203243 · Publicação no Twitter
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20957 · Aviso do Fabricante
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20957 · Nota de Segurança
• https://nvd.nist.gov/vuln/detail/CVE-2026-20957 · Nota de Segurança
• https://bdu.fstec.ru/vul/2026-00401 · Nota de Segurança
• https://osv.dev/vulnerability/CVE-2026-20957 · Aviso do Fabricante