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[ CVE-2025-53690 · Published 3 Sep 2025 ]

Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability

Exploited · CISA KEV CVSS 9.0 EPSS 61%No fix listed yet

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-09-04
  • EPSS: 61% chance of exploitation in the next 30 days (higher than 99% of CVEs)
  • Critical severity: CVSS 9.0

[ Description ]Official description

Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.

CISA: 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 25 Sep 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References