CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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
References7
- dev.sitecore.net/Downloads.aspx ProductVendor Advisory
- dev.sitecore.net/Downloads.aspx ProductVendor Advisory
- www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deseriali… ExploitPatchThird Party Advisory
- www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deseriali… ExploitPatchThird Party Advisory
- www.synacktiv.com/blog.html Third Party Advisory
- www.synacktiv.com/blog.html Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=… US Government Resource
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 25% percentile: 98 · as of 10 November 2026
- CWE
- CWE-502
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