# CVE-2025-3662: FancyBox for WordPress < 3.3.6 - Unauthenticated Stored XSS

> Unauthenticated attackers can inject malicious scripts via gallery captions in FancyBox for WordPress, potentially leading to code execution or account takeover.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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:** 3 Jun 2025
- **Updated:** 3 Jun 2025
- **Also known as:** GHSA-3q79-wmhj-39pr

## What is CVE-2025-3662?

CVE-2025-3662 is a medium-severity cross-site scripting vulnerability in Unknown FancyBox for WordPress, published on 3 Jun 2025. 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 FancyBox for WordPress plugin before 3.3.6 does not escape captions and titles attributes before using them to populate galleries' caption fields. The issue was received as a Contributor+ Stored XSS, however one of our researcher (Marc Montpas) escalated it to an Unauthenticated Stored XSS

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

## Which versions are affected by CVE-2025-3662?

It affects 1 product.


Products: Colorlib Fancybox.

## How do I fix CVE-2025-3662?

No fix has been published for CVE-2025-3662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-3662 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3662 exists.

## Other vulnerabilities in Unknown FancyBox for WordPress

- [CVE-2024-0662](https://insights.sbomify.com/CVE-2024-0662/): Cross-site scripting in FancyBox for WordPress (medium 4.4)
- [CVE-2015-1494](https://insights.sbomify.com/CVE-2015-1494/): Cross-site scripting in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-3662 and fix it if it is affected.

What it is: CVE-2025-3662 is a medium-severity cross-site scripting vulnerability in Unknown FancyBox for WordPress, published on 3 Jun 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3662 exists.

Affected product: Unknown FancyBox for WordPress. 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-2025-3662/ (Markdown: https://insights.sbomify.com/CVE-2025-3662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-3662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3662
- OSV: https://osv.dev/vulnerability/CVE-2025-3662

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-3662/
Summaries are generated and may contain mistakes; the official description above is the record.