Actively exploited · Published May 31, 2019 · Assigned by mitre
CVE-2019-9875
High 8.8 Exploited
In plain English
A high-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 25.4% (higher than 98% of all known vulnerabilities). 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 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.
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/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-2019-9875 government-resource