# CVE-2025-66026: REDAXO is Vulnerable to Reflected XSS in Mediapool Info Banner via args[types]

> Reflected XSS in REDAXO Mediapool allows arbitrary JavaScript execution in the backend context via a crafted link.

- **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:** Yes
- **Published:** 26 Nov 2025
- **Updated:** 26 Nov 2025
- **Also known as:** GHSA-x6vr-q3vf-vqgq

## What is CVE-2025-66026?

CVE-2025-66026 is a medium-severity cross-site scripting vulnerability in redaxo, published on 26 Nov 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

REDAXO is a PHP-based CMS. Prior to version 5.20.1, a reflected Cross-Site Scripting (XSS) vulnerability exists in the Mediapool view where the request parameter args[types] is rendered into an info banner without HTML-escaping. This allows arbitrary JavaScript execution in the backend context when an authenticated user visits a crafted link while logged in. This issue has been patched in version 5.20.1.

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

## Which versions are affected by CVE-2025-66026?

2 open source packages ship an affected version, including redaxo/source. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `redaxo/source` | Packagist | All versions | 5.20.1 |
| `redaxo/source` | Packagist | All versions | 5.20.1 |

Products: Redaxo Redaxo.

## How do I fix CVE-2025-66026?

Upgrade redaxo/source to 5.20.1 or later.

## Is CVE-2025-66026 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66026 exists.

## Other vulnerabilities in redaxo

- [CVE-2018-18200](https://insights.sbomify.com/CVE-2018-18200/): SQL injection in n/a (critical 9.8)
- [CVE-2018-17831](https://insights.sbomify.com/CVE-2018-17831/): SQL injection in n/a (critical 9.8)
- [CVE-2026-21857](https://insights.sbomify.com/CVE-2026-21857/): Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read (high 8.3)
- [CVE-2006-2843](https://insights.sbomify.com/CVE-2006-2843/): Code injection in n/a (high 7.5)
- [CVE-2006-2844](https://insights.sbomify.com/CVE-2006-2844/): Multiple PHP remote file inclusion vulnerabilities in Redaxo 3.0 allow remote attackers to execute arbitrary PHP code via a URL in the REX[I (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66026 and fix it if it is affected.

What it is: CVE-2025-66026 is a medium-severity cross-site scripting vulnerability in redaxo, published on 26 Nov 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-2025-66026 exists.

Affected packages and fixed versions:
- redaxo/source (Packagist): affected all versions; fixed in 5.20.1
- redaxo/source (Packagist): affected all versions; fixed in 5.20.1

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-2025-66026/ (Markdown: https://insights.sbomify.com/CVE-2025-66026/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66026
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66026
- OSV: https://osv.dev/vulnerability/CVE-2025-66026

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66026/
Summaries are generated and may contain mistakes; the official description above is the record.