JavaScript is a scripting language used in web pages and applications, where flaws in code or dependencies can enable attacks and data theft.
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Background for this topic.
JavaScript is a programming language used to add behavior to web pages and to build applications that run outside the browser, including server-side services and tooling. In browsers, scripts can read and modify a page’s content and interact with available web APIs, subject to the browser’s security boundaries.
Its main security risks include cross-site scripting (XSS), in which attacker-controlled input is executed as page code, and DOM-based flaws caused by unsafe handling of data in client-side code. Third-party scripts and package dependencies also expand the code supply chain and may expose user data or introduce vulnerable behavior. Practical controls include context-aware output encoding, avoiding unsafe DOM sinks, restrictive Content-Security-Policy rules, and reviewing, pinning, and monitoring dependencies for vulnerabilities.
The AppsFlyer Web SDK was temporarily hijacked this week with malicious code used to steal cryptocurrency in a supply-chain attack. [...]
Skia graphics lib and V8 JavaScript engine brings browser's tally of actively exploited bugs to three in 2026 Google has pushed out an emergency Chrome update to fix two previously unknown vulnerabilities that attackers were already exploiting before the patches landed.…
New attack waves from the 'PhantomRaven' supply-chain campaign are hitting the npm registry, with dozens of malicious packages that exfiltrate sensitive data from JavaScript developers. [...]