# CVE-2021-24821: Cost Calculator < 1.6 - Contributor+ Stored Cross-Site Scripting

> Contributors can inject malicious scripts via Cost Calculator fields, potentially leading to code execution or account takeover on WordPress sites.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Mar 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-p6g4-5hgj-p576

## What is CVE-2021-24821?

CVE-2021-24821 is a medium-severity cross-site scripting vulnerability in Unknown Cost Calculator, published on 7 Mar 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Cost Calculator WordPress plugin before 1.6 allows users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks via the Description fields of a Cost Calculator > Price Settings (which gets injected on the edit page as well as any page that embeds the calculator using the shortcode), as well as the Text Preview field of a Project (injected on the edit project page)

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

## Which versions are affected by CVE-2021-24821?

It affects 1 product.


Products: Nicdark Cost Calculator.

## How do I fix CVE-2021-24821?

No fix has been published for CVE-2021-24821 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24821 being exploited?

There is no known exploitation of CVE-2021-24821 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Cost Calculator

- [CVE-2023-1155](https://insights.sbomify.com/CVE-2023-1155/): Cost Calculator <= 1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting (medium 6.4)
- [CVE-2023-0165](https://insights.sbomify.com/CVE-2023-0165/): Cost Calculator <= 1.8 - Contributor+ Stored XSS (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24821 and fix it if it is affected.

What it is: CVE-2021-24821 is a medium-severity cross-site scripting vulnerability in Unknown Cost Calculator, published on 7 Mar 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24821 in the wild and no public exploit code.

Affected product: Unknown Cost Calculator. 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-2021-24821/ (Markdown: https://insights.sbomify.com/CVE-2021-24821/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24821
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24821
- OSV: https://osv.dev/vulnerability/CVE-2021-24821

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24821/
Summaries are generated and may contain mistakes; the official description above is the record.