Risk Letters

Exploited vulnerability

CVE-2025-53690

TLP:CLEAR

Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability

Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution.

Facts

  • Vendor: Sitecore
  • Product: Multiple Products
  • CVSS: 9
  • EPSS (probability of exploitation within 30 days): 60.6 %
  • On CISA's Known Exploited Vulnerabilities list since: 4 September 2025
  • First known exploitation: 4 September 2025
  • CISA's deadline for US federal agencies: 25 September 2025
  • Weakness: CWE-502
  • First seen by Risk Letters: 4 September 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