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.
Weekly headline count for the current query.
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.…
Who hasn't exploited this max-severity flaw? At least five more Chinese spy crews, Iran-linked goons, and financially motivated criminals are now attacking the React2Shell, a maximum-severity flaw in the widely used React JavaScript library, according to Google.…
Who needs JavaScript? Security researcher Lyra Rebane has devised a novel clickjacking attack that relies on Scalable Vector Graphics (SVG) and Cascading Style Sheets (CSS).…
Security community needs to rally and share more info faster, one researcher says Amid new reports of attackers pummeling a maximum security hole (CVE-2025-55182) in the React JavaScript library, Cloudflare's technology chief said his company took down its own network, forcing a widespread outage early Friday, to patch React2Shell.…
Finish reading this, then patch A maximum-severity flaw in the widely used JavaScript library React, and several React-based frameworks including Next.js allows unauthenticated, remote attackers to execute malicious code on vulnerable instances. The flaw is easy to abuse, and mass exploitation is "imminent," according to security researchers.…
Automation flaw in CI/CD workflow let a bad pull request unleash worm into npm PostHog says the Shai-Hulud 2.0 npm worm compromise was "the largest and most impactful security incident" it's ever experienced after attackers slipped malicious releases into its JavaScript SDKs and tried to auto-loot developer credentials.…
Move fast - miscreants compromised a domain controller in 17 hours Gootloader JavaScript malware, commonly used to deliver ransomware, is back in action after a period of reduced activity.…
Hundreds of compromised packages pulled as registry shifts to 2FA and trusted publishing GitHub, which owns the npm registry for JavaScript packages, says it is tightening security in response to recent attacks.…
PLUS: Discord invite links may not be safe; Miscreants find new way to hide malicious JavaScript; and more! Infosec In Brief A pair of Congressional Democrats have demanded a review of the Common Vulnerabilities and Exposures (CVE) program amid uncertainties about continued US government funding for the scheme.…
Update before that proof-of-concept comes to bite Security researchers are sounding the alarm over a fresh flaw in the JavaScript implementation of OpenPGP (OpenPGP.js) that allows both signed and encrypted messages to be spoofed.…
Damage likely limited to those running bots with private key access Malware-poisoned versions of the widely used JavaScript library @solana/web3.js were distributed via the npm package registry, according to an advisory issued Wednesday by project maintainer Steven Luscher.…
Puppeteer or Pupeter? One of them will snoop around on your machine and steal your credentials An ongoing typosquatting campaign is targeting developers via hundreds of popular JavaScript libraries, whose weekly downloads number in the tens of millions, to infect systems with info-stealing and snooping malware.…
The 'security issue' was caused by a 9.8-rated Magento flaw Adobe patched back in June Bad news for anyone who purchased a Cisco hoodie earlier this month: Suspected Russia-based attackers injected data-stealing JavaScript into the networking giant's online store selling Cisco-branded merch.…
Why keeping your PC secure and free of malware remains paramount IBM Security has dissected some JavaScript code that was injected into people's online banking pages to steal their login credentials, saying 50,000 user sessions with more than 40 banks worldwide were compromised by the malicious software in 2023.…
NPM repo hijacked after former worker phished Cryptocurrency wallet maker Ledger says someone slipped malicious code into one of its JavaScript libraries to steal more than half a million dollars from victims.…
CEO, fresh with funds, lays out the dependency dilemma Interview Open source security biz Socket is extending its source code dependency checker, which previously addressed only JavaScript and Python, by adding support for checking Go code.…
Failure to match metadata with packaged files is perfect for supply chain attacks The npm Public Registry, a database of JavaScript packages, fails to compare npm package manifest data with the archive of files that data describes, creating an opportunity for the installation and execution of malicious files.…
Perhaps a good time to check for unwelcome visitors The operators behind Gootloader, a crew dubbed UNC2565, have upgraded the code in cunning ways to make it more intrusive and harder to find.…
Also, US media hit with JavaScript supply chain attack, while half of govt employees use out-of-date mobile OSes in brief A quartet of malware-laden Android apps from a single developer have been caught with malicious code more than once, yet the infected apps remain on Google Play and have collectively been downloaded more than one million times. …
Windows Defender update fixed the mess after a weekend of false positive weirdness Microsoft appears to have fixed a problem that saw its Defender antivirus program identify apps based on the Chromium browser engine and/or Electron JavaScript framework as malware, and suggest users remove them.…