# CVE-2021-24925: Modern Events Calendar Lite < 6.1.5 - Reflected Cross-Site Scripting

> An attacker can execute arbitrary JavaScript in the victim's browser via the current_month_divider parameter in the Modern Events Calendar Lite plugin.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-jcvw-97r9-7cg7

## What is CVE-2021-24925?

CVE-2021-24925 is a medium-severity cross-site scripting vulnerability in Unknown Modern Events Calendar Lite, published on 13 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Modern Events Calendar Lite WordPress plugin before 6.1.5 does not sanitise and escape the current_month_divider parameter of its mec_list_load_more AJAX call (available to both unauthenticated and authenticated users) before outputting it back in the response, leading to a Reflected Cross-Site Scripting issue

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-24925?

It affects 1 product.


Products: Webnus Modern Events Calendar Lite.

## How do I fix CVE-2021-24925?

No fix has been published for CVE-2021-24925 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24925 being exploited?

There is no known exploitation of CVE-2021-24925 in the wild and no public exploit code.

## 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-2021-24145](https://insights.sbomify.com/CVE-2021-24145/): Modern Events Calendar Lite < 5.16.5 - Authenticated Arbitrary File Upload leading to RCE (high 7.2)
- [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-2021-24925 and fix it if it is affected.

What it is: CVE-2021-24925 is a medium-severity cross-site scripting vulnerability in Unknown Modern Events Calendar Lite, published on 13 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24925 in the wild and no public exploit code.

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-2021-24925/ (Markdown: https://insights.sbomify.com/CVE-2021-24925/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24925
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24925
- OSV: https://osv.dev/vulnerability/CVE-2021-24925

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24925/
Summaries are generated and may contain mistakes; the official description above is the record.