# CVE-2021-24498: Calendar Event Multi View < 1.4.01 - Unauthenticated Reflected Cross-Site Scripting (XSS)

> Unauthenticated attackers can execute arbitrary scripts via reflected XSS in the Calendar Event Multi View WordPress 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:** 2 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-556c-5rxg-4747

## What is CVE-2021-24498?

CVE-2021-24498 is a medium-severity cross-site scripting vulnerability in Unknown Calendar Event Multi View, published on 2 Aug 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 Calendar Event Multi View WordPress plugin before 1.4.01 does not sanitise or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php), 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-2021-24498?

It affects 1 product.


Products: Dwbooster Calendar Event Multi View.

## How do I fix CVE-2021-24498?

No fix has been published for CVE-2021-24498 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24498 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24498 exists.

Public exploit code:

- WordPress Calendar Event Multi View <1.4.01 - Cross-Site Scripting (nuclei): http/cves/2021/CVE-2021-24498.yaml

## Other vulnerabilities in Unknown Calendar Event Multi View

- [CVE-2022-2846](https://insights.sbomify.com/CVE-2022-2846/): Calendar Event Multi View < 1.4.07 - Unauthenticated Arbitrary Event Creation to Stored XSS (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24498 and fix it if it is affected.

What it is: CVE-2021-24498 is a medium-severity cross-site scripting vulnerability in Unknown Calendar Event Multi View, published on 2 Aug 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24498 exists.

Affected product: Unknown Calendar Event Multi View. 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-2021-24498/ (Markdown: https://insights.sbomify.com/CVE-2021-24498/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24498
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24498
- OSV: https://osv.dev/vulnerability/CVE-2021-24498

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24498/
Summaries are generated and may contain mistakes; the official description above is the record.