Actively exploited in the wild
Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
Sitecore - CMS and Experience Platform (XP) · Listed in the CISA KEV since 2025-03-26. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVE-2019-9875
HighCVSS 8.8KEVSummary
Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.
Risk Assessment
An authenticated attacker can execute arbitrary code on the server, potentially leading to full compromise of the application and data.
Recommendation
Update Sitecore to a patched version or apply mitigations such as input validation.
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Original NVD description (English source)
Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.