Intel

AIKIDO-2026-10462

hoppscotch-backend is vulnerable to Cross-site Scripting (XSS)

Cross-site Scripting (XSS)CVE-2026-34932

55

Medium Risk

This Affects:

JShoppscotch-backend
0.0.1 - 2026.2.1
Fixed in 2026.3.0

TL;DR

Affected versions of this package are vulnerable to stored XSS via path-based mock server responses. An attacker can create a mock example with a script-capable Content-Type and malicious HTML/JavaScript body. When the response is served through the path-based backend URL (<backend-origin>/mock/<id>/...), it is treated as same-origin with the backend, allowing the injected script to perform authenticated actions using the victim’s backend session.

Who does this affect?

You are affected if you are using a version that falls within the vulnerable range.

Background info

hoppscotch-backend is vulnerable to Cross-site Scripting (XSS) in versions 0.0.1 - 2026.2.1.

How to fix this

Upgrade the hoppscotch-backend library to the patch version.