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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.

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‘Cooperative mutation’ spots problems that checking scripts alone will miss Black Hat Asia Security researchers have devised a tool that detects flaws in the way apps like Microsoft Word and Adobe Acrobat process JavaScript, and it's proven so effective they've found 134 bugs – 59 of them considered worthy of a fix by vendors, 33 assigned a CVE number, and 17 producing bug bounty payments totaling $22,000.…

Campaign to coax GitHub-owned outfit to improve security starts showing results Special report Security consultant Lance Vick recently acquired the expired domain used by the maintainer of a widely used NPM package to remind the JavaScript community that the NPM Registry still hasn't implemented adequate security.…