# CVE-2023-1721: Yoga Class Registration System 1.0 - RCE

> Administrators can execute arbitrary commands on the server due to improper validation of uploaded class thumbnails.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jun 2023
- **Updated:** 27 Nov 2024
- **Also known as:** GHSA-fm2j-6967-6fqw

## What is CVE-2023-1721?

CVE-2023-1721 is a critical vulnerability in Yoga Class Registration System, published on 23 Jun 2023. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Yoga Class Registration System version 1.0 allows an administrator to execute commands on the server. This is possible because the application does not correctly validate the thumbnails of the classes uploaded by the administrators.

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

## Which versions are affected by CVE-2023-1721?

It affects 1 product.


Products: Yoga Class Registration System Project Yoga Class Registration System.

## How do I fix CVE-2023-1721?

No fix has been published for CVE-2023-1721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-1721 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1721 exists.

## Other vulnerabilities in Yoga Class Registration System

- [CVE-2023-1722](https://insights.sbomify.com/CVE-2023-1722/): Yoga Class Registration System 1.0 - ATO (critical 9.1)
- [CVE-2023-29626](https://insights.sbomify.com/CVE-2023-29626/): SQL injection in n/a (high 7.5)
- [CVE-2023-1366](https://insights.sbomify.com/CVE-2023-1366/): SourceCodester Yoga Class Registration System manage_category.php query sql injection (medium 6.3)
- [CVE-2023-0980](https://insights.sbomify.com/CVE-2023-0980/): SourceCodester Yoga Class Registration System Status Update update_status.php sql injection (medium 6.3)
- [CVE-2023-0981](https://insights.sbomify.com/CVE-2023-0981/): SourceCodester Yoga Class Registration System Delete User sql injection (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-1721 and fix it if it is affected.

What it is: CVE-2023-1721 is a critical vulnerability in Yoga Class Registration System, published on 23 Jun 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1721 exists.

Affected product: Yoga Class Registration System. 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-2023-1721/ (Markdown: https://insights.sbomify.com/CVE-2023-1721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1721
- OSV: https://osv.dev/vulnerability/CVE-2023-1721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1721/
Summaries are generated and may contain mistakes; the official description above is the record.