Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability (CVE-2019-9875)
Severity: high · Patch status: patched · Since 2025-03-26 · CVE-2019-9875
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. CISA added CVE-2019-9875 to its Known Exploited Vulnerabilities catalog on Mar 26, 2025, which means attackers are exploiting it in the wild.
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.
- US federal agencies must remediate by Apr 16, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch