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CVE-2025-53690 is a critical deserialization of untrusted data vulnerability in Sitecore Experience Manager (XM) and Sitecore Experience Platform (XP) through version 9.0, with reporting also indicating exposure in Experience Commerce and certain Managed Cloud deployments when configured with legacy sample cryptographic material. The flaw is associated with ASP.NET ViewState handling: if a deployment uses a default, sample, or otherwise exposed machineKey, an attacker can forge a malicious ViewState payload that the application will accept as valid and deserialize. Because the deserialized data can contain attacker-controlled .NET objects, successful exploitation can trigger arbitrary code execution in the Sitecore web application context. Reporting also notes exploitation against public-facing Sitecore endpoints, including blocked.aspx, using crafted HTTP POST requests carrying malicious ViewState data. The issue has been observed in the wild as a zero-day and is widely characterized as pre-authentication remote code execution in affected internet-facing deployments.
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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.
119 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A critical zero-day vulnerability in Sitecore reportedly used for initial access by the Chinese state-sponsored operation UAT-8837 against North American critical infrastructure entities.
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.