# CVE-2021-24667: Gallery Blocks with Lightbox < 2.2.1- Authenticated Stored Cross-Site Scripting

> Authenticated attackers can inject arbitrary scripts via image metadata in the Gallery Blocks with Lightbox plugin, potentially compromising user sessions.

- **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:** 30 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7x7j-cf43-24q8

## What is CVE-2021-24667?

CVE-2021-24667 is a medium-severity cross-site scripting vulnerability in Unknown Gallery Blocks with Lightbox. Image Gallery, (HTML5 video , YouTube, Vimeo) Video Gallery and Lightbox for native gallery, published on 30 Aug 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

A stored cross-site scripting vulnerability has been discovered in : Simply Gallery Blocks with Lightbox (Version – 2.2.0 & below). The vulnerability exists in the Lightbox functionality where a user with low privileges is allowed to execute arbitrary script code within the context of the application. This vulnerability is due to insufficient validation of image parameters in meta data.

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

## Which versions are affected by CVE-2021-24667?

It affects 1 product.


Products: Simplygallery Simply Gallery Blocks With Lightbox.

## How do I fix CVE-2021-24667?

No fix has been published for CVE-2021-24667 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24667 being exploited?

There is no known exploitation of CVE-2021-24667 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Gallery Blocks with Lightbox. Image Gallery, (HTML5 video , YouTube, Vimeo) Video Gallery and Lightbox for native gallery

- [CVE-2023-0441](https://insights.sbomify.com/CVE-2023-0441/): Gallery Blocks with Lightbox < 3.0.8 - Subscriber+ Arbitrary Options Update (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24667 and fix it if it is affected.

What it is: CVE-2021-24667 is a medium-severity cross-site scripting vulnerability in Unknown Gallery Blocks with Lightbox. Image Gallery, (HTML5 video , YouTube, Vimeo) Video Gallery and Lightbox for native gallery, published on 30 Aug 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-2021-24667 in the wild and no public exploit code.

Affected product: Unknown Gallery Blocks with Lightbox. Image Gallery, (HTML5 video , YouTube, Vimeo) Video Gallery and Lightbox for native gallery. 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-2021-24667/ (Markdown: https://insights.sbomify.com/CVE-2021-24667/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24667
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24667
- OSV: https://osv.dev/vulnerability/CVE-2021-24667

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-24667/
Summaries are generated and may contain mistakes; the official description above is the record.