CVE-2023-23630: Eta.js Eta

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Eta is an embedded JS templating engine that works inside Node, Deno, and the browser. XSS attack - anyone using the Express API is impacted. The problem has been resolved. Users should upgrade to version 2.0.0. As a workaround, don't pass user supplied things directly to `res.render`.

Affected products

• Eta.js Eta: before 2.0.0 (fixed in 2.0.0)

Published 2023-02-01. Last modified 2026-06-17.