Vulnerability library
Security checkMarch 22, 2026

Elysia Cookie Value Prototype Pollution

Understand the exposure, see the recommended fix, and check whether your own website has related weaknesses.

Medium severitynpmelysia

Check your website

Find this and other vulnerabilities with a free scan.

Your scan runs on your computer. No account required.

Description

Elysia cookie can be overridden by prototype pollution , eg. __proto__

Recommendation

Update the elysia package to the latest compatible version. Followings are version details:

  • Affected version(s): < 1.4.27
  • Patched version(s): 1.4.27

References

Could your website be exposed too?

SmartScanner can check your website for Elysia Cookie Value Prototype Pollution and gives you actionable findings to investigate.

Start a free scan

Related Issues

You might also like:

Apache and Express Path Traversal plus Nginx Restriction Bypass Tests with SmartScanner

10 Secure Coding Best Practices to Follow in Every Project

Update Cheat Sheet for Developers

See something that needs correcting? Let us knowUpdated March 22, 2026