# CVE-2026-6454: Cross-site scripting in Firelight Lightbox

> Authenticated contributors can inject arbitrary scripts via PDF href attributes in Firelight Lightbox, leading to stored XSS execution on user interaction.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 24 Jul 2026
- **Updated:** 24 Jul 2026
- **Also known as:** GHSA-ccv6-5mc2-jm5q

## What is CVE-2026-6454?

CVE-2026-6454 is a medium-severity cross-site scripting vulnerability in firelightwp Firelight Lightbox, published on 24 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Firelight Lightbox plugin for WordPress is vulnerable to Stored DOM Cross-Site Scripting in versions up to and including 2.3.20. This is due to insufficient sanitization of the href attribute value within the FancyBox V2 PDF beforeLoad JavaScript callback generated in inc/fancybox-2.php, where this.href is string-concatenated directly into an HTML string without escaping, allowing a stored href containing entity-encoded double-quotes to break out of the data attribute and inject arbitrary event handlers into the DOM. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user clicks the malicious PDF link.

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

## Which versions are affected by CVE-2026-6454?


## How do I fix CVE-2026-6454?

No fix has been published for CVE-2026-6454 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6454 being exploited?

There is no known exploitation of CVE-2026-6454 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6454 and fix it if it is affected.

What it is: CVE-2026-6454 is a medium-severity cross-site scripting vulnerability in firelightwp Firelight Lightbox, published on 24 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-6454 in the wild and no public exploit code.

Affected product: firelightwp Firelight 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-2026-6454/ (Markdown: https://insights.sbomify.com/CVE-2026-6454/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6454
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6454
- OSV: https://osv.dev/vulnerability/CVE-2026-6454

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6454/
Summaries are generated and may contain mistakes; the official description above is the record.