CVE-2019-9875 — Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
Overview
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.
Vulnerability details
- CVE ID
- CVE-2019-9875
- Vulnerability
- Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
- Vendor
- Sitecore
- Affected products
- Sitecore: CMS and Experience Platform (XP)
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- Published
- 2025-03-26
Remediation guidance
CVE-2019-9875 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for Sitecore the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2019-9875 — and stay ahead of the next one
CVE-2019-9875 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2019-9875 and other Sitecore issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
📡 Get a free alert the moment a CVE like this lands in the KEV catalog → Join Sentinel APEX on Telegram