CVE-2019-9874
KEVSitecore CMS and Experience Platform (XP) Deserialization Vulnerability
Description
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.
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.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedMay 31, 2019
Last modifiedJun 17, 2026
Added to KEVMar 26, 2025
Remediation dueApr 16, 2025
References
- dev.sitecore.net/Downloads.aspxProductVendor Advisory
- synacktiv.com/blog.htmlThird Party Advisory
- synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdfExploitPatch
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9874US Government Resource
0 recent articles mention this CVE
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Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 559 days
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 83.7% · top 1% of all CVEs
- Weakness
- CWE-502
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.