{"id":13393,"date":"2026-06-05T07:03:41","date_gmt":"2026-06-05T07:03:41","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/06\/05\/claude-code-github-action-flaw-let-one-html\/"},"modified":"2026-06-05T07:03:41","modified_gmt":"2026-06-05T07:03:41","slug":"claude-code-github-action-flaw-let-one-html","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/06\/05\/claude-code-github-action-flaw-let-one-html\/","title":{"rendered":"Claude Code GitHub Action Flaw Let One Malicious Issue Hijack Repositories"},"content":{"rendered":"<p>    Claude Code GitHub Action Flaw Let One Malicious Issue Hijack Repositories<br \/>\n \t<BR><br \/>\n<BR><\/BR><br \/>\n    <!-- no image --><br \/>\n \t<BR><br \/>\n<BR><\/BR><\/p>\n<div>A security researcher found a flaw in Anthropic&#8217;s Claude Code GitHub Action that let an attacker take over vulnerable public repositories running it, with nothing more than a single opened GitHub issue. Because Anthropic&#8217;s own action repo used the same workflow, a working attack could have pushed malicious code into the action itself and onto the projects downstream that pull it.<\/p>\n<p>RyotaK of GMO<\/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\/claude-code-github-action-flaw-let-one.html\">Go to TheHackersNews<\/a><br \/>\n \t<BR><br \/>\n <BR><\/BR><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Claude Code GitHub Action Flaw Let One Malicious Issue Hijack Repositories A security researcher found a flaw in Anthropic&#8217;s Claude Code GitHub Action that let an attacker take over vulnerable public repositories running it, with nothing more than a single opened GitHub issue. Because Anthropic&#8217;s own action repo used the same workflow, a working attack [&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-13393","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\/13393"}],"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=13393"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/13393\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=13393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=13393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=13393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}