{"id":221431,"date":"2025-09-05T03:20:47","date_gmt":"2025-09-05T08:20:47","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2025\/09\/hackers-exploited-sitecore-zero-day-flaw-to-deploy-backdoors"},"modified":"2025-09-05T03:20:47","modified_gmt":"2025-09-05T08:20:47","slug":"hackers-exploited-sitecore-zero-day-flaw-to-deploy-backdoors","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2025\/09\/hackers-exploited-sitecore-zero-day-flaw-to-deploy-backdoors","title":{"rendered":"Hackers exploited Sitecore zero-day flaw to deploy backdoors"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/hackers-exploited-sitecore-zero-day-flaw-to-deploy-backdoors.jpg\"><\/a><\/p>\n<p>Threat actors have been exploiting a zero-day vulnerability in legacy Sitecore deployments to deploy WeepSteel reconnaissance malware.<\/p>\n<p>The flaw, tracked under CVE-2025\u201353690, is a ViewState deserialization vulnerability caused by the inclusion of a sample ASP.NET machine key in pre-2017 Sitecore guides.<\/p>\n<p>Some customers reused this key in production, allowing attackers with knowledge of the key to craft valid, but malicious \u2018_VIEWSTATE\u2019 payloads that tricked the server into deserializing and executing them, leading to remote code execution (RCE).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Threat actors have been exploiting a zero-day vulnerability in legacy Sitecore deployments to deploy WeepSteel reconnaissance malware. The flaw, tracked under CVE-2025\u201353690, 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 [\u2026]<\/p>\n","protected":false},"author":427,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-221431","post","type-post","status-publish","format-standard","hentry","category-cybercrime-malcode"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/221431","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/427"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=221431"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/221431\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=221431"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=221431"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=221431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}