Extensions
Malicious VSCode extensions on Microsoft’s registry drop infostealers
Two malicious extensions on Microsoft’s Visual Studio Code Marketplace infect developers’ machines with information-stealing malware that can take screenshots, steal credentials, crypto wallets, and hijack browser sessions. The marketplace hosts extensions for the popular VSCode integrated development environment (IDE) to extend functionality or add customization options. The two malicious extensions, called Bitcoin Black and Codo […]
ShadyPanda browser extensions amass 4.3M installs in malicious campaign
A long-running malware operation known as “ShadyPanda” has amassed over 4.3 million installations of seemingly legitimate Chrome and Edge browser extensions that evolved into malware. The operation, discovered by Koi Security, unfolded in distinct phases that gradually introduced additional malicious functionality, turning the browser extension from a legitimate tool into spyware. The ShadyPanda campaign consists […]
GlassWorm malware returns on OpenVSX with 3 new VSCode extensions
The GlassWorm malware campaign, which impacted the OpenVSX and Visual Studio Code marketplaces last month, has returned with three new VSCode extensions that have already been downloaded over 10,000 times. GlassWorm is a campaign and malware that leverages Solana transactions to fetch a payload targeting GitHub, NPM, and OpenVSX account credentials, as well as cryptocurrency […]
AI-Slop ransomware test sneaks on to VS Code marketplace
A malicious extension with basic ransomware capabilities seemingly created with the help of AI, has been published on Microsoft’s official VS Code marketplace. Named susvsex and published by ‘suspublisher18,’ the extension’s malicious functionality is openly advertised in its description. Secure Annex researcher John Tuckner discovered susvsex and says that it is the product of “vibe coding” and is far from sophisticated. Despite […]
Fake Solidity VSCode extension on Open VSX backdoors developers
A remote access trojan dubbed SleepyDuck, and disguised as the well-known Solidity extension in the Open VSX open-source registry, uses an Ethereum smart contract to establish a communication channel with the attacker. Open VSX is a community-driven registry for extensions compatible with VS Code, which are popular with AI-powered integrated development environments (IDEs) like Cursor and Windsurf. […]
Mozilla: New Firefox extensions must disclose data collection practices
Starting next month, Mozilla will require Firefox extension developers to disclose whether their add-ons collect or share user data with third parties. The devs will be required to disclose any new extension’s data practices in the manifest.json file using a dedicated browser_specific_settings.gecko.data_collection_permissions key beginning November 3, 2025. Mozilla will also require all extension developers to […]
Microsoft Edge to block malicious sideloaded extensions
Microsoft is planning to introduce a new Edge security feature that will protect users against malicious extensions sideloaded into the web browser. Edge enables developers to install extensions locally (also known as sideloading) for testing purposes before publishing them to the Microsoft Edge Add-ons store by toggling the “Developer Mode” option on the Extensions management page and clicking the […]
Mozilla now lets Firefox add-on devs roll back bad updates
Mozilla has announced a new feature that enables Firefox extension developers to roll back to previously approved versions, allowing them to quickly address critical bugs and issues. Once the latest extension version is reverted, users will no longer be able to install it. If automatic updates are enabled, the web browser will also automatically revert […]
Wave of 150 crypto-draining extensions hits Firefox add-on store
A malicious campaign dubbed ‘GreedyBear’ has snuck onto the Mozilla add-ons store, targeting Firefox users with 150 malicious extensions and stealing an estimated $1,000,000 from unsuspecting victims. The campaign, discovered and documented by Koi Security, impersonates cryptocurrency wallet extensions from well-known platforms such as MetaMask, TronLink, and Rabby. These extensions are uploaded in a benign form […]
Mozilla warns of phishing attacks targeting add-on developers
Mozilla has warned browser extension developers of an active phishing campaign targeting accounts on its official AMO (addons.mozilla.org) repository. Mozilla’s add-on platform hosts over 60,000 browser extensions and more than 500,000 themes used by tens of millions of users worldwide. According to Mozilla’s advisory, these phishing emails are impersonating the AMO team and claim that the targeted developer accounts […]