# CVE-2025-48203: [clickstorm] SEO (cs_seo) TYPO3 extension Cross-site Scripting (XSS) vulnerability

> Cross-site scripting vulnerability in the cs_seo extension for TYPO3 allows attackers to inject malicious scripts.

- **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:** Yes
- **Published:** 21 May 2025
- **Updated:** 21 May 2025
- **Also known as:** GHSA-6p8w-pc35-mqv8

## What is CVE-2025-48203?

CVE-2025-48203 is a medium-severity cross-site scripting vulnerability in TYPO3 cs seo extension, published on 21 May 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The cs_seo extension through 9.2.0 for TYPO3 allows XSS.

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

## Which versions are affected by CVE-2025-48203?

8 open source packages ship an affected version, including clickstorm/cs-seo.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `clickstorm/cs-seo` | Packagist | From 6.3.0 | 6.8.0 |
| `clickstorm/cs-seo` | Packagist | From 6.3.0 | 6.8.0 |
| `clickstorm/cs-seo` | Packagist | From 7.0.0 | 7.5.0 |
| `clickstorm/cs-seo` | Packagist | From 7.0.0 | 7.5.0 |
| `clickstorm/cs-seo` | Packagist | From 8.0.0 | 8.4.0 |
| `clickstorm/cs-seo` | Packagist | From 8.0.0 | 8.4.0 |
| `clickstorm/cs-seo` | Packagist | From 9.0.0 | 9.3.0 |
| `clickstorm/cs-seo` | Packagist | From 9.0.0 | 9.3.0 |

## How do I fix CVE-2025-48203?

Upgrade clickstorm/cs-seo to a fixed version for your release line: 6.8.0, 7.5.0, 8.4.0 or 9.3.0.

## Is CVE-2025-48203 being exploited?

There is no known exploitation of CVE-2025-48203 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-48203 and fix it if it is affected.

What it is: CVE-2025-48203 is a medium-severity cross-site scripting vulnerability in TYPO3 cs seo extension, published on 21 May 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-48203 in the wild and no public exploit code.

Affected packages and fixed versions:
- clickstorm/cs-seo (Packagist): affected from 6.3.0; fixed in 6.8.0
- clickstorm/cs-seo (Packagist): affected from 6.3.0; fixed in 6.8.0
- clickstorm/cs-seo (Packagist): affected from 7.0.0; fixed in 7.5.0
- clickstorm/cs-seo (Packagist): affected from 7.0.0; fixed in 7.5.0
- clickstorm/cs-seo (Packagist): affected from 8.0.0; fixed in 8.4.0
- clickstorm/cs-seo (Packagist): affected from 8.0.0; fixed in 8.4.0
- clickstorm/cs-seo (Packagist): affected from 9.0.0; fixed in 9.3.0
- clickstorm/cs-seo (Packagist): affected from 9.0.0; fixed in 9.3.0

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-2025-48203/ (Markdown: https://insights.sbomify.com/CVE-2025-48203/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-48203
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-48203
- OSV: https://osv.dev/vulnerability/CVE-2025-48203

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-48203/
Summaries are generated and may contain mistakes; the official description above is the record.