# CVE-2020-26174: File upload in n/a

> Attackers can bypass client-side file type restrictions to upload arbitrary files as attachments, potentially leading to code execution or data modification.

- **Severity:** High 8.8 (`CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N`)
- **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:** 18 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-g862-hhr5-33gv

## What is CVE-2020-26174?

CVE-2020-26174 is a high-severity vulnerability in n/a, published on 18 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

tangro Business Workflow before 1.18.1 requests a list of allowed filetypes from the server and restricts uploads to the filetypes contained in this list. However, this restriction is enforced in the browser (client-side) and can be circumvented. This allows an attacker to upload any file as an attachment to a workitem.

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

## Which versions are affected by CVE-2020-26174?

It affects 1 product.


Products: Tangro Business Workflow.

## How do I fix CVE-2020-26174?

No fix has been published for CVE-2020-26174 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-26174 being exploited?

There is no known exploitation of CVE-2020-26174 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-26175](https://insights.sbomify.com/CVE-2020-26175/): Missing authorization in n/a (medium 6.5)
- [CVE-2020-26178](https://insights.sbomify.com/CVE-2020-26178/): Missing authorization in n/a (medium 5.3)
- [CVE-2020-26171](https://insights.sbomify.com/CVE-2020-26171/): Missing authorization in n/a (medium 4.3)
- [CVE-2020-26176](https://insights.sbomify.com/CVE-2020-26176/): Missing authorization in n/a (medium 4.3)
- [CVE-2020-26177](https://insights.sbomify.com/CVE-2020-26177/): Missing authorization in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26174 and fix it if it is affected.

What it is: CVE-2020-26174 is a high-severity vulnerability in n/a, published on 18 Dec 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-2020-26174 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-2020-26174/ (Markdown: https://insights.sbomify.com/CVE-2020-26174/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26174
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26174
- OSV: https://osv.dev/vulnerability/CVE-2020-26174

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-26174/
Summaries are generated and may contain mistakes; the official description above is the record.