Upgrade Eta Now to Patch XSS Vulnerability

CVSScvssV3_1: 8.6

Eta is a popular JavaScript templating engine used by many Node.js and Deno developers. A critical cross-site scripting (XSS) vulnerability was recently discovered in Eta that could allow attackers to execute malicious scripts on users’ browsers or servers.

The vulnerability resides in how Eta renders templates. If user-supplied data is passed directly to the rendering function without sanitization, an attacker could craft input containing malicious JavaScript that would be executed by anyone using the affected code. This poses a risk to the confidentiality and integrity of systems.

To exploit the vulnerability, an attacker would need to trick a user into interacting with a malicious website or opening a boobytrapped file. The malicious content would then run with the same privileges as the vulnerable Eta application in the user’s browser or server environment. This could allow the attacker to steal sensitive data like cookies or passwords, change how the affected site works, or use the compromised machine for other malicious purposes.

The good news is Eta developers have released version 2.0.0 which fixes the problem. All Eta users are urged to upgrade immediately. As an interim workaround, developers should avoid directly passing untrusted user input to Eta’s rendering functions without sanitization. Proper input validation can prevent similar issues in the future. Keeping software updated is also important for ongoing security and protection against threats.