CVE-2019-9875—Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

Vulnerability Name

Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

Description

Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

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.

Additional Notes

• https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0038556
• https://nvd.nist.gov/vuln/detail/CVE-2019-9875

Related News Articles

• Hard-Coded 'b' Password in Sitecore XP Sparks Major RCE Risk in Enterprise DeploymentsJune 17, 2025
• CISA Warns of Sitecore RCE Flaws; Active Exploits Hit Next.js and DrayTek DevicesMarch 27, 2025

Related Weaknesses

• CWE-502