# CVE-2018-14520: Kirby CMS 2.5.12 Cross-site Scripting

> Cross-site scripting in Kirby CMS allows attackers to inject malicious scripts via HTTP requests, potentially leading to code execution or account takeover.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Aug 2022
- **Updated:** 17 Jun 2025
- **Also known as:** GHSA-h3w2-qg2r-c7mf

## What is CVE-2018-14520?

CVE-2018-14520 is a medium-severity cross-site scripting vulnerability in n/a, published on 24 Aug 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in Kirby 2.5.12. The application allows malicious HTTP requests to be sent in order to trick a user into adding web pages.

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

## Which versions are affected by CVE-2018-14520?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `getkirby/cms` | Packagist | All versions to 2.5.12 | None |
| `getkirby/cms` | Packagist | All versions to 2.5.12 | None |

Products: Getkirby Kirby.

## How do I fix CVE-2018-14520?

No fix has been published for CVE-2018-14520 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-14520 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-14520 exists.

## Other vulnerabilities in n/a

- [CVE-2024-26483](https://insights.sbomify.com/CVE-2024-26483/): Kirby vulnerable to unrestricted file upload of user avatar images (high 8.8)
- [CVE-2024-41964](https://insights.sbomify.com/CVE-2024-41964/): Insufficient permission checks in the language settings in Kirby CMS (high 8.1)
- [CVE-2026-34587](https://insights.sbomify.com/CVE-2026-34587/): Kirby has Server-Side Template Injection (SSTI) via double template resolution in option rendering (high 7.6)
- [CVE-2021-29460](https://insights.sbomify.com/CVE-2021-29460/): Cross-site scripting (XSS) from unsanitized uploaded SVG files (high 7.6)
- [CVE-2023-38489](https://insights.sbomify.com/CVE-2023-38489/): Kirby vulnerable to Insufficient Session Expiration after a password change (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-14520 and fix it if it is affected.

What it is: CVE-2018-14520 is a medium-severity cross-site scripting vulnerability in n/a, published on 24 Aug 2022. Any signed-in user can exploit it over the network, 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-2018-14520 exists.

Affected packages and fixed versions:
- getkirby/cms (Packagist): affected all versions up to 2.5.12; no fix listed
- getkirby/cms (Packagist): affected all versions up to 2.5.12; no fix listed

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-2018-14520/ (Markdown: https://insights.sbomify.com/CVE-2018-14520/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-14520
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-14520
- OSV: https://osv.dev/vulnerability/CVE-2018-14520

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-14520/
Summaries are generated and may contain mistakes; the official description above is the record.