# 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.

- **Severity:** High 8.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **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 available:** No
- **Published:** 2 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-wj4r-hr4h-g98v

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-34932?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2026-50160/): Mass Assignment via Onboarding Endpoint Allows Unauthenticated JWT_SECRET Overwrite (critical 10.0)
- [CVE-2026-28215](https://insights.sbomify.com/CVE-2026-28215/): hoppscotch Vulnerable to Unauthenticated Onboarding Config Takeover (critical 9.1)
- [CVE-2026-34931](https://insights.sbomify.com/CVE-2026-34931/): hoppscotch: Improper loopback redirect_uri validation in device-login flow (high 8.5)
- [CVE-2026-28216](https://insights.sbomify.com/CVE-2026-28216/): hoppscotch has IDOR in updateUserEnvironment / deleteUserEnvironment (high 8.3)
- [CVE-2022-0121](https://insights.sbomify.com/CVE-2022-0121/): Cross-site Scripting in hoppscotch/hoppscotch (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34932 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-34932 in the wild and no public exploit code.

Affected product: hoppscotch. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34932/ (Markdown: https://insights.sbomify.com/CVE-2026-34932/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34932
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34932
- OSV: https://osv.dev/vulnerability/CVE-2026-34932

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34932/
Summaries are generated and may contain mistakes; the official description above is the record.