{"id":11648,"date":"2026-03-27T07:03:48","date_gmt":"2026-03-27T07:03:48","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/03\/27\/claude-extension-flaw-enabled-zero-html\/"},"modified":"2026-03-27T07:03:48","modified_gmt":"2026-03-27T07:03:48","slug":"claude-extension-flaw-enabled-zero-html","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/03\/27\/claude-extension-flaw-enabled-zero-html\/","title":{"rendered":"Claude Extension Flaw Enabled Zero-Click XSS Prompt Injection via Any Website"},"content":{"rendered":"<p>    Claude Extension Flaw Enabled Zero-Click XSS Prompt Injection via Any Website<br \/>\n \t<BR><br \/>\n<BR><\/BR><br \/>\n    <!-- no image --><br \/>\n \t<BR><br \/>\n<BR><\/BR><\/p>\n<div>Cybersecurity researchers have disclosed a vulnerability in Anthropic&#8217;s Claude Google Chrome Extension that could have been exploited to trigger malicious prompts simply by visiting a web page.<br \/>\nThe flaw &#8220;allowed any website to silently inject prompts into that assistant as if the user wrote them,&#8221; Koi Security researcher Oren Yomtov said in a report shared with The Hacker News. &#8220;No clicks, no<\/div>\n<p> \t<BR><br \/>\n <BR><\/BR><\/p>\n<p> \t<BR><br \/>\n<BR><\/BR><br \/>\n<a href=\"https:\/\/thehackernews.com\/2026\/03\/claude-extension-flaw-enabled-zero.html\">Go to TheHackersNews<\/a><br \/>\n \t<BR><br \/>\n <BR><\/BR><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Claude Extension Flaw Enabled Zero-Click XSS Prompt Injection via Any Website Cybersecurity researchers have disclosed a vulnerability in Anthropic&#8217;s Claude Google Chrome Extension that could have been exploited to trigger malicious prompts simply by visiting a web page. The flaw &#8220;allowed any website to silently inject prompts into that assistant as if the user wrote [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[60],"tags":[76],"class_list":["post-11648","post","type-post","status-publish","format-standard","hentry","category-thehackersnews","tag-thehackersnews"],"_links":{"self":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/11648"}],"collection":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/comments?post=11648"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/11648\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=11648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=11648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=11648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}