# CVE-2021-42839: Grand Vice info Co. webopac7 - Arbitrary File Upload

> Remote attackers with general user permissions can upload malicious scripts to execute arbitrary code or disrupt services in webopac7.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Nov 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-mhvw-gjfc-ccqf

## What is CVE-2021-42839?

CVE-2021-42839 is a high-severity vulnerability in Grand Vice info Co. webopac7, published on 15 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Grand Vice info Co. webopac7 file upload function fails to filter special characters. While logging in with general user’s permission, remote attackers can upload malicious script and execute arbitrary code to control the system or interrupt services.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2021-42839?

It affects 1 product.


Products: Vice Webopac.

## How do I fix CVE-2021-42839?

No fix has been published for CVE-2021-42839 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42839 being exploited?

There is no known exploitation of CVE-2021-42839 in the wild and no public exploit code.

## Other vulnerabilities in Grand Vice info Co. webopac7

- [CVE-2024-11016](https://insights.sbomify.com/CVE-2024-11016/): Grand Vice info Webopac - SQL Injection (critical 9.8)
- [CVE-2024-11018](https://insights.sbomify.com/CVE-2024-11018/): Grand Vice info Webopac - Arbitrary File Upload (critical 9.8)
- [CVE-2024-11020](https://insights.sbomify.com/CVE-2024-11020/): Grand Vice info Webopac7 - SQL Injection (critical 9.8)
- [CVE-2024-11017](https://insights.sbomify.com/CVE-2024-11017/): Grand Vice info Webopac - Arbitrary File Upload (high 8.8)
- [CVE-2024-11019](https://insights.sbomify.com/CVE-2024-11019/): Grand Vice info Webopac7 - Reflected XSS (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42839 and fix it if it is affected.

What it is: CVE-2021-42839 is a high-severity vulnerability in Grand Vice info Co. webopac7, published on 15 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-42839 in the wild and no public exploit code.

Affected product: Grand Vice info Co. webopac7. 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-2021-42839/ (Markdown: https://insights.sbomify.com/CVE-2021-42839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42839
- OSV: https://osv.dev/vulnerability/CVE-2021-42839

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42839/
Summaries are generated and may contain mistakes; the official description above is the record.