# CVE-2021-42335: Huachu Digital Technology Co.,Ltd. Easytest - Stored XSS

> Remote attackers with user privileges can inject JavaScript into the bulletin board, leading to stored XSS attacks on the Easytest online learning platform.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Oct 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-89rc-4jgm-q84x

## What is CVE-2021-42335?

CVE-2021-42335 is a medium-severity cross-site scripting vulnerability in Huachu Digital Technology Co.,Ltd. Easytest, published on 15 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Easytest bulletin board management function of online learning platform does not filter special characters. After obtaining a user’s privilege, remote attackers can inject JavaScript and execute stored XSS attack.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-42335?

It affects 1 product.


Products: Huaju Easytest Online Learning Test Platform.

## How do I fix CVE-2021-42335?

No fix has been published for CVE-2021-42335 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42335 being exploited?

There is no known exploitation of CVE-2021-42335 in the wild and no public exploit code.

## Other vulnerabilities in Huachu Digital Technology Co.,Ltd. Easytest

- [CVE-2021-42333](https://insights.sbomify.com/CVE-2021-42333/): Huachu Digital Technology Co.,Ltd. Easytest - SQL Injection-1 (high 8.8)
- [CVE-2021-42334](https://insights.sbomify.com/CVE-2021-42334/): Huachu Digital Technology Co.,Ltd. Easytest - SQL Injection-2 (high 8.8)
- [CVE-2021-42336](https://insights.sbomify.com/CVE-2021-42336/): Huachu Digital Technology Co.,Ltd. Easytest - Improper Authorization (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42335 and fix it if it is affected.

What it is: CVE-2021-42335 is a medium-severity cross-site scripting vulnerability in Huachu Digital Technology Co.,Ltd. Easytest, published on 15 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-42335 in the wild and no public exploit code.

Affected product: Huachu Digital Technology Co.,Ltd. Easytest. 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-2021-42335/ (Markdown: https://insights.sbomify.com/CVE-2021-42335/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42335
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42335
- OSV: https://osv.dev/vulnerability/CVE-2021-42335

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-42335/
Summaries are generated and may contain mistakes; the official description above is the record.