[ SECURITY ADVISORY DOSSIER // CIAMISKAB-CSIRT ]

Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability

CVE-2025-53690 Critical CVSS 9 In-The-Wild Exploited

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Ringkasan Kerentanan (Vulnerability Overview)

Rilis: 01 October 2026

Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution.

Tindakan Mitigasi yang Wajib Diterapkan (Required Action)

Instruksi Keamanan untuk Pengelola TI / OPD

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Seluruh pengelola server dan aplikasi di lingkungan OPD Kabupaten Ciamis diimbau untuk segera mengaudit perangkat terdampak dan mengaplikasikan patch sebelum batas waktu mitigasi.

Produk & Versi Terdampak

Produk	Versi Basis	Batas Terdampak	Status Keamanan
Experience Manager (XM)	0	—	AFFECTED
Experience Platform (XP)	0	—	AFFECTED

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Threat Intelligence Matrix

CVE Identifier

CVE-2025-53690

Vendor / Project Sitecore

Produk Terdampak Multiple Products

Skor CVSS

9 / 10.0

Status Eksploitasi AKTIF (In-The-Wild)

Kampanye Ransomware Tidak Diketahui

Automatable (Wormable) Unknown

Dampak Teknis Total

Sumber Intelijen CISA KEV

Butuh Pendampingan Mitigasi?

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Peringatan Lainnya

CVE-2026-17544 High

Out-of-bounds write in bccomp() via crafted operand and scale

CVE-2026-17543 High

SQL injection in ext-pgsql via E'...' backslash breakout

CVE-2026-7260 Medium

Stack overflow in phar with circular symlinks

CVE-2026-109619 Critical

RCE via stale global state

CSIRT Assistant

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