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CVE-2025-53690: Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability

criticalknown exploitedpublic exploitCVE-2025-53690
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Sitecoreproduct: Experience Manager, Experience Platform, Experience Commerce, Managed CloudUnsafe deserializationRemote code execution
What
The vulnerability allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution.
Who is affected
Deployments of Sitecore products with default machine keys.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Update to the latest version of Sitecore products.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-09-04
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-53690

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-53690coverage & exploitation statusNVD · CVE.org

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