CVE-2025-53690
China-linked hackers exploited Sitecore zero-day for initial access
An advanced threat actor tracked as UAT-8837 and believed to be linked to China has been focusing on critical infrastructure systems in North America, gaining access by exploiting both known and zero-day vulnerabilities. The hacker group has been active since at least 2025, and its purpose appears to be mainly to obtain initial access to […]
3 mins read
Hackers exploited Sitecore zero-day flaw to deploy backdoors
Threat actors have been exploiting a zero-day vulnerability in legacy Sitecore deployments to deploy WeepSteel reconnaissance malware. The flaw, tracked under CVE-2025-53690, is a ViewState deserialization vulnerability caused by the inclusion of a sample ASP.NET machine key in pre-2017 Sitecore guides. Some customers reused this key in production, allowing attackers with knowledge of the key […]
2 mins read