Actively exploited · Published May 31, 2019 · Assigned by mitre
CVE-2019-9874
Critical 9.8 Exploited
In plain English
A critical-severity unsafe deserialization in CMS and Experience Platform (XP) from Sitecore. Attackers are actively exploiting it in the wild (listed by CISA on March 26, 2025). The chance it is exploited in the next 30 days is estimated at 83.7% (higher than 99.7% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Apr 16, 2025.
Official description
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.
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://dev.sitecore.net/Downloads.aspx x_refsource_MISC
- https://www.synacktiv.com/blog.html x_refsource_MISC
- https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9874 government-resource