CVE-2026-34932 hoppscotch: Stored XSS via mock server responses on backend origin
Attackers can inject malicious scripts via mock server responses, leading to stored XSS and potential CSRF attacks in the Hoppscotch web application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-34932?
CVE-2026-34932 is a high-severity cross-site scripting vulnerability in hoppscotch, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
hoppscotch is an open source API development ecosystem. Prior to version 2026.3.0, there is a stored XSS vulnerability that can lead to CSRF. This issue has been patched in version 2026.3.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-34932?
It affects 1 product.
Products include Hoppscotch Hoppscotch.
How do I fix CVE-2026-34932?
No fix has been published for CVE-2026-34932 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-34932 being exploited?
There is no known exploitation of CVE-2026-34932 in the wild and no public exploit code.
Other vulnerabilities in hoppscotch
- CVE-2026-50160 Mass Assignment via Onboarding Endpoint Allows Unauthenticated JWT_SECRET Overwrite
- CVE-2026-28215 hoppscotch Vulnerable to Unauthenticated Onboarding Config Takeover
- CVE-2026-34931 hoppscotch: Improper loopback redirect_uri validation in device-login flow
- CVE-2026-28216 hoppscotch has IDOR in updateUserEnvironment / deleteUserEnvironment
- CVE-2022-0121 Cross-site Scripting in hoppscotch/hoppscotch
Sources
Also known as GHSA-wj4r-hr4h-g98v.