# CVE-2020-5846: File upload in n/a

> Authenticated attackers can upload malicious JSP files to any directory, leading to remote code execution and full system access.

- **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:** 6 Jan 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-wmc6-394v-6mrx

## What is CVE-2020-5846?

CVE-2020-5846 is a high-severity vulnerability in n/a, published on 6 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An insecure file upload and code execution issue was discovered in Ahsay Cloud Backup Suite 8.3.0.30 via a "PUT /obs/obm7/file/upload" request with the base64-encoded pathname in the X-RSW-custom-encode-path HTTP header, and the content in the HTTP request body. It is possible to upload a file into any directory of the server. One can insert a JSP shell into the web server's directory and execute it. This leads to full system access as the configured user (e.g., Administrator) when starting from any authenticated session (e.g., a trial account). This is fixed in the 83/830122/cbs-*-hotfix-task26000 builds.

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

## Which versions are affected by CVE-2020-5846?

It affects 1 product.


Products: Ahsay Cloud Backup Suite.

## How do I fix CVE-2020-5846?

No fix has been published for CVE-2020-5846 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5846 being exploited?

There is no known exploitation of CVE-2020-5846 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2026-105134](https://insights.sbomify.com/CVE-2026-105134/): Ahsay AhsayCBS Command Injection (critical 10.0, exploited in the wild)
- [CVE-2026-105133](https://insights.sbomify.com/CVE-2026-105133/): Ahsay AhsayCBS Improper Authentication (medium 6.9, exploited in the wild)
- [CVE-2019-10267](https://insights.sbomify.com/CVE-2019-10267/): File upload in n/a (high 8.8)
- [CVE-2019-10265](https://insights.sbomify.com/CVE-2019-10265/): Path traversal in n/a (high 7.5)
- [CVE-2019-10266](https://insights.sbomify.com/CVE-2019-10266/): XML external entity in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5846 and fix it if it is affected.

What it is: CVE-2020-5846 is a high-severity vulnerability in n/a, published on 6 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5846 in the wild and no public exploit code.

Affected product: n/a. 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-2020-5846/ (Markdown: https://insights.sbomify.com/CVE-2020-5846/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5846
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5846
- OSV: https://osv.dev/vulnerability/CVE-2020-5846

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5846/
Summaries are generated and may contain mistakes; the official description above is the record.