Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability (CVE-2025-53690)
Severity: critical · Patch status: unknown · Since 2025-09-04 · CVE-2025-53690
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. CISA added CVE-2025-53690 to its Known Exploited Vulnerabilities catalog on Sep 4, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Sep 25, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
