What’s Vulnerable › Vulnerabilities

CVE-2019-9875: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-03-26
• EPSS: 25.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-05-31 · updated 2026-06-17
• Weakness: CWE-502

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

• Sitecore Cms: through 9.1

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

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