ACTIVELY EXPLOITED
CVE-2019-9875: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
| Vendor | Sitecore |
|---|---|
| Product | CMS and Experience Platform (XP) |
| Actively exploited | Yes |
| Added to CISA KEV | 26 Mar 2025 |
| CISA federal deadline | 16 Apr 2025 |
| Weakness (CWE) | CWE-502 |
Required action (CISA's text)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description (NVD)
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.
SOURCES
Other Sitecore flaws
- CVE-2025-53690: Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability
- CVE-2019-9874: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
- CVE-2021-42237: Sitecore XP Remote Command Execution Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.