# CVE-2021-24145: Modern Events Calendar Lite < 5.16.5 - Authenticated Arbitrary File Upload leading to RCE

> Administrators can upload arbitrary PHP files via CSV import, leading to remote code execution on the WordPress site.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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:** 18 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-5vmg-gchf-rcpm

## What is CVE-2021-24145?

CVE-2021-24145 is a high-severity vulnerability in Unknown Modern Events Calendar Lite, published on 18 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Arbitrary file upload in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not properly check the imported file, allowing PHP ones to be uploaded by administrator by using the 'text/csv' content-type in the request.

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

## Which versions are affected by CVE-2021-24145?

It affects 1 product.


Products: Webnus Modern Events Calendar Lite.

## How do I fix CVE-2021-24145?

No fix has been published for CVE-2021-24145 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24145 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24145 exists.

Public exploit code:

- WordPress File Upload Vulnerability, Modern Events Calendar Lite WordPress plugin before 5.16.5 (github_poc): https://github.com/dnr6419/CVE-2021-24145
- Wordpress Plugin Modern Events Calendar - Authenticated Remote Code Execution (metasploit)
- Wordpress Plugin Modern Events Calendar 5.16.2 - Remote Code Execution (Authenticated) (exploitdb)
- WordPress Modern Events Calendar Lite <5.16.5 - Authenticated Arbitrary File Upload (nuclei): http/cves/2021/CVE-2021-24145.yaml

## Other vulnerabilities in Unknown Modern Events Calendar Lite

- [CVE-2021-24946](https://insights.sbomify.com/CVE-2021-24946/): Modern Events Calendar < 6.1.5 - Unauthenticated Blind SQL Injection (critical 9.8)
- [CVE-2021-24149](https://insights.sbomify.com/CVE-2021-24149/): Modern Events Calendar Lite < 5.16.6 - Authenticated SQL Injection (high 8.8)
- [CVE-2021-24146](https://insights.sbomify.com/CVE-2021-24146/): Modern Events Calendar Lite < 5.16.5 - Unauthenticated Events Export (high 7.5)
- [CVE-2021-24925](https://insights.sbomify.com/CVE-2021-24925/): Modern Events Calendar Lite < 6.1.5 - Reflected Cross-Site Scripting (medium 6.1)
- [CVE-2021-4458](https://insights.sbomify.com/CVE-2021-4458/): Modern Events Calendar Lite <= 6.3.0 - Unauthenticated SQL Injection (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24145 and fix it if it is affected.

What it is: CVE-2021-24145 is a high-severity vulnerability in Unknown Modern Events Calendar Lite, published on 18 Mar 2021. 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-2021-24145 exists.

Affected product: Unknown Modern Events Calendar Lite. 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-2021-24145/ (Markdown: https://insights.sbomify.com/CVE-2021-24145/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24145
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24145
- OSV: https://osv.dev/vulnerability/CVE-2021-24145

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24145/
Summaries are generated and may contain mistakes; the official description above is the record.