Sitecore · CMS and Experience Platform (XP)
CVE-2019-9874
Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
What it is
Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to 7.2 and Sitecore XP 7.5 to 8.2 allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.
CISA: Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.
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: April 16, 2025
More exploited flaws from Sitecore
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Mar 26, 2025 | Deserialization | CMS and Experience Platform (XP) | High 8.8 | 25% |
| Sep 4, 2025 | Deserialization of Untrusted Data | Multiple Products | Critical 9.0 | 61% |
| Mar 25, 2022 | Remote Command Execution | XP | Critical 9.8 | 98% |
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.