Risk Letters

Exploited vulnerability

CVE-2019-9875

TLP:CLEAR

Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

Facts

  • Vendor: Sitecore
  • Product: CMS and Experience Platform (XP)
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 25.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 26 March 2025
  • First known exploitation: 26 March 2025
  • CISA's deadline for US federal agencies: 16 April 2025
  • Weakness: CWE-502
  • First seen by Risk Letters: 26 March 2025

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD