Sitecore · Multiple Products

CVE-2025-53690

Sitecore Products ViewState Deserialization Vulnerability

Exploited in attacks Critical 9.0 Attack chance: 61%

What it is

Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.

CISA: 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.

What to do

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

Deadline for US federal agencies: September 25, 2025

Added to the CISA list: September 4, 2025
Published: September 3, 2025
Severity: Critical 9.0 CVSS 3.1
Chance of attacks in the next 30 days (EPSS): 61% in the top 0.9% of all known vulnerabilities
Weakness: CWE-502
More details: NVD · CVE.org · CISA

All references (2)

More exploited flaws from Sitecore

Added	Vulnerability	Product	Severity	Attack chance
Mar 26, 2025	DeserializationCVE-2019-9874	CMS and Experience Platform (XP)	Critical 9.8	84%
Mar 26, 2025	DeserializationCVE-2019-9875	CMS and Experience Platform (XP)	High 8.8	25%
Mar 25, 2022	Remote Command ExecutionCVE-2021-42237used by ransomware	XP	Critical 9.8	98%

All of them →

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.