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CVE-2025-53690 is a critical insecure deserialization vulnerability in Sitecore Experience Manager (XM) and Sitecore Experience Platform (XP) through version 9.0, with reporting also indicating impact to Sitecore Experience Commerce and certain Managed Cloud deployments. The flaw is associated with ASP.NET ViewState processing and arises when affected Sitecore deployments use exposed sample or default machineKey values, allowing attacker-crafted ViewState data to be accepted as valid and deserialized. Successful exploitation can occur pre-authentication against internet-facing Sitecore endpoints and results in arbitrary code execution in the context of the web application, commonly the IIS application pool identity.
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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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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
120 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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).
A zero-day ViewState deserialization vulnerability affecting SiteCore products, reportedly exploited in recent activity and associated with UAT-8837 infrastructure and TTPs.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.