Know Your Enemy: Browser-Based Attack Techniques in 2026

Browser-based attacks are increasingly common as many business applications are accessed through browsers. Most breaches originate from a browser session and may remain confined to it, with the entire attack sequence unfolding within the browser. As a result, certain browser-based attack techniques are expected to be significant concerns for security teams. These techniques are noteworthy because they can enable an entire attack chain to occur within a browser session, from initial access to data exfiltration. Security teams should be aware of the most dangerous browser-based attack techniques in order to effectively defend against them. Six key techniques are identified as being particularly noteworthy in this context.