CVE-2019-9875
Published 2019-05-31 · Updated 2026-06-17 · Source cve@mitre.org
Summary
CVE-2019-9875 is a high-severity (CVSS 8.8) vulnerability in Sitecore CMS and Experience Platform (XP). CISA added it to the Known Exploited Vulnerabilities catalog on March 26, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 16, 2025. CISA does not currently list it as used in ransomware campaigns. Sitecore has 4 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.
All 4 known-exploited Sitecore vulnerabilities →Description
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Sitecore — CMS and Experience Platform (XP)
Name: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
Date added: 2025-03-26 · Due: 2025-04-16
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.
References
- https://dev.sitecore.net/Downloads.aspx
- https://www.synacktiv.com/blog.html
- https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf
- https://dev.sitecore.net/Downloads.aspx
- https://www.synacktiv.com/blog.html
- https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9875