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.
Microsoft researchers have detailed an exploit chain, named AutoJack, that turns an AI browsing agent into a delivery vehicle for remote code execution
As many as 145 npm packages associated with the Mastra namespace ("@mastra/*"), a popular open-source JavaScript and TypeScript framework for building artificial intelligence (AI) applications, have been compromised as part of a software supply chain attack codenamed easy-day-js, per findings from Endor Labs, JFrog, OX Security, SafeDep, Socket, StepSecurity, and Synk
An attacker tampered with trusted JavaScript files used by WordPress sites running PushEngage, OptinMonster, and TrustPulse, turning those files into a way to break into the sites
Attackers compromised Awesome Motive CDN files, backdooring WordPress sites running OptinMonster, TrustPulse, and PushEngage. Sansec researchers discovered an active supply chain attack hitting WordPress sites running OptinMonster, TrustPulse, and PushEngage, three plugins operated by Awesome Motive, one of the largest WordPress plugin companies in the world. The malicious JavaScript wasn’t sitting on any victim’s server. […]