# CVE-2021-24357: FooGallery < 2.0.35 - Authenticated Stored Cross-Site Scripting

> Authenticated attackers can inject malicious scripts via the Custom CSS field in FooGallery, leading to stored XSS attacks against site visitors.

- **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:** 14 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-2q7g-6q23-mgp7

## What is CVE-2021-24357?

CVE-2021-24357 is a medium-severity cross-site scripting vulnerability in FooPlugins Best Image Gallery & Responsive Photo Gallery – FooGallery, published on 14 Jun 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

In the Best Image Gallery & Responsive Photo Gallery – FooGallery WordPress plugin before 2.0.35, the Custom CSS field of each gallery is not properly sanitised or validated before being being output in the page where the gallery is embed, leading to a stored Cross-Site Scripting issue.

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

## Which versions are affected by CVE-2021-24357?

It affects 1 product.


Products: Fooplugins Foogallery.

## How do I fix CVE-2021-24357?

No fix has been published for CVE-2021-24357 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24357 being exploited?

There is no known exploitation of CVE-2021-24357 in the wild and no public exploit code.

## Other vulnerabilities in FooPlugins Best Image Gallery & Responsive Photo Gallery – FooGallery

- [CVE-2023-6947](https://insights.sbomify.com/CVE-2023-6947/): Best WordPress Gallery Plugin – FooGallery <= 2.4.16 - Authenticated (Contributor+) Directory Traversal (high 7.7)
- [CVE-2023-44244](https://insights.sbomify.com/CVE-2023-44244/): WordPress FooGallery Plugin <= 2.2.44 is vulnerable to Cross Site Scripting (XSS) (high 7.1)
- [CVE-2023-29439](https://insights.sbomify.com/CVE-2023-29439/): WordPress FooGallery Plugin <= 2.2.35 is vulnerable to Cross Site Scripting (XSS) (high 7.1)
- [CVE-2025-6068](https://insights.sbomify.com/CVE-2025-6068/): Cross-site scripting in Gallery by FooGallery (medium 6.4)
- [CVE-2024-12119](https://insights.sbomify.com/CVE-2024-12119/): Cross-site scripting in Gallery by FooGallery (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24357 and fix it if it is affected.

What it is: CVE-2021-24357 is a medium-severity cross-site scripting vulnerability in FooPlugins Best Image Gallery & Responsive Photo Gallery – FooGallery, published on 14 Jun 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-2021-24357 in the wild and no public exploit code.

Affected product: FooPlugins Best Image Gallery & Responsive Photo Gallery – FooGallery. 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-2021-24357/ (Markdown: https://insights.sbomify.com/CVE-2021-24357/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24357
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24357
- OSV: https://osv.dev/vulnerability/CVE-2021-24357

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-24357/
Summaries are generated and may contain mistakes; the official description above is the record.