{"id":220924,"date":"2026-03-07T06:21:00","date_gmt":"2026-03-07T11:21:00","guid":{"rendered":"https:\/\/news-you-need.com\/index.php\/2026\/03\/07\/anthropic-finds-22-firefox-vulnerabilities-using-claude-opus-4-6-ai-model\/"},"modified":"2026-03-07T08:05:09","modified_gmt":"2026-03-07T13:05:09","slug":"anthropic-finds-22-firefox-vulnerabilities-using-claude-opus-4-6-ai-model","status":"publish","type":"post","link":"https:\/\/news-you-need.com\/index.php\/2026\/03\/07\/anthropic-finds-22-firefox-vulnerabilities-using-claude-opus-4-6-ai-model\/","title":{"rendered":"Anthropic Finds 22 Firefox Vulnerabilities Using Claude Opus 4.6 AI Model"},"content":{"rendered":"

Anthropic Finds 22 Firefox Vulnerabilities Using Claude Opus 4.6 AI Model<\/a><\/p>\n

https:\/\/thehackernews.com\/2026\/03\/anthropic-finds-22-firefox.html<\/a><\/p>\n

Publish Date: 2026-03-07 06:21:00<\/a><\/p>\n

Source Domain: thehackernews.com<\/a><\/p>\n

\ue804Ravie Lakshmanan<\/span>\ue802Mar 07, 2026<\/span><\/span>Browser Security \/ Artificial Intelligence<\/span><\/p>\n

Anthropic on Friday said it discovered 22 new security vulnerabilities in the Firefox web browser as part of a security partnership with Mozilla.<\/p>\n

Of these, 14 have been classified as high, seven have been classified as moderate, and one has been rated low in severity. The issues were addressed in Firefox 148, released late last month. The vulnerabilities were identified over a two-week period in January 2026.<\/p>\n

The artificial intelligence (AI) company said the number of high-severity bugs identified by its Claude Opus 4.6 large language model (LLM) represents “almost a fifth” of all high-severity vulnerabilities that were patched in Firefox in 2025.<\/p>\n

Anthropic said the LLM detected a use-after-free bug in the browser’s JavaScript after “just” 20 minutes of exploration, which was then validated by a human researcher in a virtualized environment to rule out the possibility of a false positive.<\/p>\n

“By the end of this effort, we had scanned nearly 6,000 C++ files and submitted a total of 112 unique reports, including the high- and moderate-severity vulnerabilities mentioned above,” the company said. “Most issues have been fixed in Firefox 148, with the remainder to be fixed in upcoming releases.”<\/p>\n

The AI upstart said it also fed its Claude model access to the entire list of vulnerabilities submitted to Mozilla and tasked the AI tool with developing a practical exploit for them.<\/p>\n

Despite carrying out the test several hundred times and spending about $4,000 in API credits, the company said Claude Opus 4.6 was able to turn the security defect into an exploit only in two cases.<\/p>\n

This behavior, the company added, signaled two important aspects: the cost of identifying vulnerabilities is cheaper than creating an exploit for them, and the model is better at finding issues than at exploiting them.<\/p>\n

\"\"<\/p>\n

“However, the fact that Claude could succeed at automatically developing a crude browser exploit, even if…<\/p>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Anthropic Finds 22 Firefox Vulnerabilities Using Claude Opus 4.6 AI Model https:\/\/thehackernews.com\/2026\/03\/anthropic-finds-22-firefox.html Publish Date: 2026-03-07…<\/p>\n","protected":false},"author":1,"featured_media":220925,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEg2DaQuy20IkM7M8iL7NBmzJhI9m5KDEpf6CBgxcI9rAhiVLO1VyfdAeQKaInOY3dlIiwy1FWtusinpu8Yyj1fChemLiVCTLnMLRtKaKNvDbOOa0ZjVFt5zoT7yON1ljb2DAlgki_aVmVuWSmAPn2jFszCpJdjzN7DGGRzeEzD5OYcSn2oeLzcaBARYzmOS\/s1600\/firefox-claude.jpg","fifu_image_alt":"","footnotes":""},"categories":[15],"tags":[26,20,31,18,17],"class_list":["post-220924","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity","tag-ai","tag-artificial-intelligence","tag-exploit","tag-large-language-model","tag-llm"],"_links":{"self":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/220924"}],"collection":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/comments?post=220924"}],"version-history":[{"count":1,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/220924\/revisions"}],"predecessor-version":[{"id":220926,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/220924\/revisions\/220926"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media\/220925"}],"wp:attachment":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media?parent=220924"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/categories?post=220924"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/tags?post=220924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}