{"id":13986,"date":"2026-07-01T07:03:35","date_gmt":"2026-07-01T07:03:35","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/07\/01\/microsoft-warns-poisoned-mcp-tool-html\/"},"modified":"2026-07-01T07:03:35","modified_gmt":"2026-07-01T07:03:35","slug":"microsoft-warns-poisoned-mcp-tool-html","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/07\/01\/microsoft-warns-poisoned-mcp-tool-html\/","title":{"rendered":"Microsoft Warns Poisoned MCP Tool Descriptions Can Make AI Agents Leak Data"},"content":{"rendered":"<p>    Microsoft Warns Poisoned MCP Tool Descriptions Can Make AI Agents Leak Data<br \/>\n \t<BR><br \/>\n<BR><\/BR><br \/>\n    <!-- no image --><br \/>\n \t<BR><br \/>\n<BR><\/BR><\/p>\n<div>New Microsoft\u00a0research\u00a0shows how attackers can hijack AI agents that act on a user&#8217;s behalf, using nothing more than a poisoned tool description to make the agent quietly hand over company data to an outsider.<\/p>\n<p>The trick is that the agent never breaks a rule. Every step looks routine, so in a default setup no alarm may fire.<\/p>\n<p>The work comes from Microsoft Incident Response and its<\/p><\/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\/06\/microsoft-warns-poisoned-mcp-tool.html\">Go to TheHackersNews<\/a><br \/>\n \t<BR><br \/>\n <BR><\/BR><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft Warns Poisoned MCP Tool Descriptions Can Make AI Agents Leak Data New Microsoft\u00a0research\u00a0shows how attackers can hijack AI agents that act on a user&#8217;s behalf, using nothing more than a poisoned tool description to make the agent quietly hand over company data to an outsider. The trick is that the agent never breaks a [&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-13986","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\/13986"}],"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=13986"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/13986\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=13986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=13986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=13986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}