CVE Watch19 de ago. de 2026

CVE-2026-55040

Microsoft SharePoint Weak Authentication Vulnerability

CVSS

9.1

Crítica

EPSS

69.5%

p99

KEV

SIM

18 de ago. de 2026

Exploit Today

0-100

Publicado: 14 de jul. de 2026 · Última mod.: 19 de ago. de 2026 · CWE-1390

EPSS · 30d

69.5%EPSS · 30 dias69.5%

2026-10-082026-11-05

Ficha do catálogo KEV

Produto

Microsoft / SharePoint

Vulnerabilidade

Microsoft SharePoint Weak Authentication Vulnerability

Adicionado ao KEV

18 de ago. de 2026

Corrigir até

21 de ago. de 2026

Uso conhecido em ransomware

Não

Descrição resumida

Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.

Ação necessária

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Notas

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-55040

Descrição técnica

Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.

Referências oficiais

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