CVE-2019-9874
Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 16 April 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 83.74% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 26 March 2025 · due 16 April 2025
- Weakness
- CWE-502
- Affected
- sitecore/cms · sitecore/experience platform
- Source
- cve@mitre.org
EPSS 83.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0334035 ; https://nvd.nist.gov/vuln/detail/CVE-2019-9874
References
- https://dev.sitecore.net/Downloads.aspxProduct, Vendor Advisory
- https://www.synacktiv.com/blog.htmlThird Party Advisory
- https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdfExploit, Patch, Third Party Advisory
- https://dev.sitecore.net/Downloads.aspxProduct, Vendor Advisory
- https://www.synacktiv.com/blog.htmlThird Party Advisory
- https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdfExploit, Patch, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9874US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.