# CVE-2021-24693: Simple Download Monitor < 3.9.5 - Contributor+ Stored Cross-Site Scripting via File Thumbnail

> Contributors can inject malicious scripts via file thumbnails, potentially leading to admin account creation or plugin installation by reviewers.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 8 Nov 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7pfq-9m7r-jmg6

## What is CVE-2021-24693?

CVE-2021-24693 is a critical cross-site scripting vulnerability in Unknown Simple Download Monitor, published on 8 Nov 2021. 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 Simple Download Monitor WordPress plugin before 3.9.5 does not escape the "File Thumbnail" post meta before outputting it in some pages, which could allow users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks. Given the that XSS is triggered even when the Download is in a review state, contributor could make JavaScript code execute in a context of a reviewer such as admin and make them create a rogue admin account, or install a malicious plugin

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

## Which versions are affected by CVE-2021-24693?

It affects 1 product.


Products: Tipsandtricks-Hq Simple Download Monitor.

## How do I fix CVE-2021-24693?

No fix has been published for CVE-2021-24693 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24693 being exploited?

There is no known exploitation of CVE-2021-24693 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Simple Download Monitor

- [CVE-2021-24696](https://insights.sbomify.com/CVE-2021-24696/): Simple Download Monitor < 3.9.9 - Multiple CSRF (high 8.8)
- [CVE-2020-5651](https://insights.sbomify.com/CVE-2020-5651/): SQL injection in Simple Download Monitor (high 8.8)
- [CVE-2021-24695](https://insights.sbomify.com/CVE-2021-24695/): Simple Download Monitor < 3.9.6 - Unauthenticated Log Access (high 7.5)
- [CVE-2021-24692](https://insights.sbomify.com/CVE-2021-24692/): Simple Download Monitor < 3.9.5 - Contributor+ Arbitrary File Download via Path Traversal (medium 6.5)
- [CVE-2021-24697](https://insights.sbomify.com/CVE-2021-24697/): Simple Download Monitor < 3.9.5 - Reflected Cross-Site Scripting (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24693 and fix it if it is affected.

What it is: CVE-2021-24693 is a critical cross-site scripting vulnerability in Unknown Simple Download Monitor, published on 8 Nov 2021. 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-2021-24693 in the wild and no public exploit code.

Affected product: Unknown Simple Download Monitor. 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-2021-24693/ (Markdown: https://insights.sbomify.com/CVE-2021-24693/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24693
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24693
- OSV: https://osv.dev/vulnerability/CVE-2021-24693

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24693/
Summaries are generated and may contain mistakes; the official description above is the record.