# CVE-2023-5820: Cross-site request forgery in Thumbnail Slider With Lightbox

> Unauthenticated attackers can trick administrators into uploading arbitrary files via CSRF in the Thumbnail Slider With Lightbox plugin.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 27 Oct 2023
- **Updated:** 5 Feb 2025
- **Also known as:** GHSA-7mmg-6fhp-9mw2

## What is CVE-2023-5820?

CVE-2023-5820 is a critical vulnerability in nik00726 Thumbnail Slider With Lightbox, published on 27 Oct 2023. 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 Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Cross-Site Request Forgery in version 1.0. This is due to missing or incorrect nonce validation on the addedit functionality. This makes it possible for unauthenticated attackers to upload arbitrary files via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2023-5820?

It affects 1 product.


Products: I13websolution Thumbnail Slider With Lightbox.

## How do I fix CVE-2023-5820?

No fix has been published for CVE-2023-5820 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5820 being exploited?

There is no known exploitation of CVE-2023-5820 in the wild and no public exploit code.

## Other vulnerabilities in nik00726 Thumbnail Slider With Lightbox

- [CVE-2015-10146](https://insights.sbomify.com/CVE-2015-10146/): Thumbnail Slider With Lightbox <= 1.0.4 - Authenticated (Admin+) SQL Injection (medium 4.9)
- [CVE-2023-5621](https://insights.sbomify.com/CVE-2023-5621/): Thumbnail Slider With Lightbox <= 1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via Image Title (medium 4.4)
- [CVE-2023-5531](https://insights.sbomify.com/CVE-2023-5531/): Thumbnail Slider With Lightbox <= 1.0 - Cross-Site Request Forgery (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5820 and fix it if it is affected.

What it is: CVE-2023-5820 is a critical vulnerability in nik00726 Thumbnail Slider With Lightbox, published on 27 Oct 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-5820 in the wild and no public exploit code.

Affected product: nik00726 Thumbnail Slider With Lightbox. 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-2023-5820/ (Markdown: https://insights.sbomify.com/CVE-2023-5820/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5820
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5820
- OSV: https://osv.dev/vulnerability/CVE-2023-5820

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5820/
Summaries are generated and may contain mistakes; the official description above is the record.