# CVE-2019-9554: Cross-site scripting in n/a

> Cross-site scripting vulnerability in Craft CMS allows attackers to inject malicious scripts via the header insertion field, potentially compromising user sessions.

- **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:** 31 Dec 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-3ffr-8mcm-r575

## What is CVE-2019-9554?

CVE-2019-9554 is a medium-severity cross-site scripting vulnerability in Craftcms Craft Cms, published on 31 Dec 2019. 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

In the 3.1.12 Pro version of Craft CMS, XSS has been discovered in the header insertion field when adding source code at an s/admin/entries/news/new URI.

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

## Which versions are affected by CVE-2019-9554?

It affects 1 product.


Products: Craftcms Craft Cms.

## How do I fix CVE-2019-9554?

No fix has been published for CVE-2019-9554 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-9554 being exploited?

There is no known exploitation of CVE-2019-9554 in the wild and no public exploit code.

Public exploit code:

- Craft CMS 3.1.12 Pro - Cross-Site Scripting (exploitdb)

## Other vulnerabilities in Craftcms Craft Cms

- [CVE-2025-32432](https://insights.sbomify.com/CVE-2025-32432/): Craft CMS Code Injection (critical 10.0, exploited in the wild)
- [CVE-2024-56145](https://insights.sbomify.com/CVE-2024-56145/): Craft CMS Code Injection (critical 9.3, exploited in the wild)
- [CVE-2025-23209](https://insights.sbomify.com/CVE-2025-23209/): Craft CMS Code Injection (high 8.1, exploited in the wild)
- [CVE-2025-35939](https://insights.sbomify.com/CVE-2025-35939/): Craft CMS External Control of Assumed-Immutable Web Parameter (medium 6.9, exploited in the wild)
- [CVE-2023-41892](https://insights.sbomify.com/CVE-2023-41892/): Craft CMS Remote Code Execution vulnerability (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-9554 and fix it if it is affected.

What it is: CVE-2019-9554 is a medium-severity cross-site scripting vulnerability in Craftcms Craft Cms, published on 31 Dec 2019. 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-2019-9554 in the wild and no public exploit code.

Affected product: Craftcms Craft Cms. 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-2019-9554/ (Markdown: https://insights.sbomify.com/CVE-2019-9554/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-9554
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-9554
- OSV: https://osv.dev/vulnerability/CVE-2019-9554

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-9554/
Summaries are generated and may contain mistakes; the official description above is the record.