CVE-2026-55040

Katalog CVE

CVSS 9.1 · Critical KEV · sudah dieksploitasi EPSS 69,5%

Kerentanan Weak Authentication pada microsoft sharepoint server. Skor CVSS 3.1 9.1 (Critical) menurut microsoft.com. Masuk katalog KEV CISA pada 18 Agustus 2026, artinya sudah terbukti dieksploitasi.

Deskripsi (NVD)

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

Advisory KUTIM-CSIRT

• Peringatan Keamanan: Kerentanan Kritis CVE-2026-55040 Pelewatan Otentikasi pada Microsoft SharePoint 19 Agt 2026

Rincian

Terbit di NVD

14 Juli 2026

Terakhir diubah

19 Agustus 2026

Status NVD

Analyzed

CVSS 3.1

9.1 (Critical), sumber microsoft.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-1390: Weak Authentication

EPSS (30 hari)

69,5% peluang dieksploitasi; lebih tinggi dari 99,3% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama

Microsoft SharePoint Weak Authentication Vulnerability

Masuk KEV

18 Agustus 2026

Tenggat CISA

21 Agustus 2026 (untuk instansi federal AS)

Ransomware

Belum tercatat

Tindakan wajib

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.

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040 patch · advisory vendor
• https://www.rapid7.com/blog/post/ra-microsoft-sharepoint-jwt-token-authentication-bypass-cve-2026-55040/ pemerintah AS
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55040 exploit · advisory pihak ketiga
• https://github.com/sfewer-r7/CVE-2026-55040 exploit