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CVE-2025-53690 is an insecure deserialization vulnerability affecting Sitecore deployments that retain publicly known sample ASP.NET machineKey values. An unauthenticated attacker can forge malicious ViewState data that passes cryptographic validation and triggers arbitrary code execution during server-side deserialization. Sample keys were published in Sitecore deployment documentation through 2017 and subsequently retained in production installations. Affected-version descriptions differ: XM and XP are identified as affected through version 9.0, while configuration-dependent exposure is also described for any version of XM, XP, Experience Commerce, and Managed Cloud. The vulnerability was actively exploited as a zero-day in September 2025.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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122 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical Sitecore remote code execution vulnerability, rated CVSS 9.0, involving publicly documented sample machineKey values retained in production deployments. Attackers forge malicious ViewState data and submit it to an unauthenticated endpoint to trigger deserialization and execute code. The reported exploitation delivered WEEPSTEEL, followed by application-directory collection, local administrator account creation, and SAM/SYSTEM dumping. The content identifies a public proof of concept and CISA KEV inclusion on September 4, 2025. Updated deployments generate unique keys; remediation includes replacing known or reused keys.
A critical unauthenticated remote code execution vulnerability in Sitecore XM/XP/XC caused by ViewState deserialization, associated with known default ASP.NET machine keys.
A critical Sitecore vulnerability that CISA reports is under active exploitation in the wild.
A critical Sitecore ASP.NET ViewState insecure deserialization issue caused by default/sample ASP.NET machineKey values, enabling attackers to forge ViewState payloads, bypass authentication, and achieve remote code execution (RCE) (noted as running under IIS NETWORK SERVICE).
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Cross-references every affected SKU, including bundled OEM variants.
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