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CVE-2025-53690: Critical Sitecore Vulnerability Under Active Exploitation

What’s Happening?

• Affected Systems: Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud versions up to 9.0 that were deployed using sample ASP.NET machine keys (pre-2017 deployment guide defaults) TechRadarSitecore SupportThe Hacker News.
• Vulnerability Type: ViewState deserialization via exposed machine keys — a path to remote code execution (RCE) The Hacker NewsGoogle CloudCCB SafeonwebHelp Net Security.
• Severity: CVSS score of 9.0/10, designated critical TechRadarCCB SafeonwebNVD.
• Exploitation Status: Actively exploited in the wild. Mandiant intervened to disrupt attacks using malware like WEEPSTEEL, along with reconnaissance tools such as Earthworm, DWAgent, SharpHound, and others TechRadarThe Hacker NewsSC Media.
• Regulatory Notice: The U.S. CISA has ordered all federal civilian agencies to patch affected systems by September 25, 2025 The Hacker NewsThe Record from Recorded Future.

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What You Need to Do — Mitigation Steps

1. Rotate Machine Keys Immediately
   Replace any static or sample machine keys in web.config files with unique, secure keys. Sitecore SupportSC Media
2. Deploy Patches ASAP
   Apply official Sitecore security updates. If patches aren’t available yet, consider taking systems offline until safe. Sitecore SupportCCB Safeonweb
3. Enable ViewState Protection
   Ensure ASP.NET’s ViewState MAC validation is active to prevent deserialization manipulation.
4. Strengthen Access Controls
   Restrict access to web.config, limit administrative privileges, and implement least-privilege policies.
5. Monitor for Indicators of Compromise (IOCs)
   Watch for signs like ViewState-based payloads, unexpected admin account creation, credential dumps (SAM/SYSTEM), or network tunneling tools. The Record from Recorded FutureSC Media
6. Follow CISA Guidance Under BOD 22-01
   Ensure compliance with required patching protocols or decommission vulnerable deployments. NVD

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CyberDudeBivash Ecosystem at Your Service

• Apps & Tools: cyberdudebivash.com/apps — for rapid patch triage and monitoring
• Live Threat Intel: cyberbivash.blogspot.com — real-time critical CVE alerts and attack summaries
• Plugin & Configuration Security Insights: cryptobivash.code.blog — deep dives into CMS misconfigurations
• Incident Playbooks & Consulting: Custom guidance for handling zero-day, deserialization attacks, and ViewState-based threats

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