# CVE-2018-5233: Grav CMS Cross-site scripting (XSS) vulnerability

> Remote attackers can inject arbitrary web script or HTML via PATH_INFO in Grav CMS admin tools, potentially compromising user sessions.

- **Severity:** Medium 6.1 (`CVSS:3.0/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:** 19 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-977g-93f5-rqjx

## What is CVE-2018-5233?

CVE-2018-5233 is a medium-severity cross-site scripting vulnerability in n/a, published on 19 Mar 2018. 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

Cross-site scripting (XSS) vulnerability in system/src/Grav/Common/Twig/Twig.php in Grav CMS before 1.3.0 allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO to admin/tools.

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

## Which versions are affected by CVE-2018-5233?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `getgrav/grav` | Packagist | All versions | 1.3.0 |
| `getgrav/grav` | Packagist | All versions | 1.3.0 |

Products: Getgrav Grav Cms.

## How do I fix CVE-2018-5233?

Upgrade getgrav/grav to 1.3.0 or later.

## Is CVE-2018-5233 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-5233 exists.

Public exploit code:

- Grav CMS <1.3.0 - Cross-Site Scripting (nuclei): http/cves/2018/CVE-2018-5233.yaml

## Other vulnerabilities in n/a

- [CVE-2020-29553](https://insights.sbomify.com/CVE-2020-29553/): Grav CMS Cross-Site Request Forgery (CSRF) (high 8.8)
- [CVE-2020-29555](https://insights.sbomify.com/CVE-2020-29555/): Grav CMS Arbitrary File Deletion (high 8.1)
- [CVE-2019-16126](https://insights.sbomify.com/CVE-2019-16126/): Cross-site Scripting in Grav (medium 6.1)
- [CVE-2020-29556](https://insights.sbomify.com/CVE-2020-29556/): Grav CMS Local File Injection (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-5233 and fix it if it is affected.

What it is: CVE-2018-5233 is a medium-severity cross-site scripting vulnerability in n/a, published on 19 Mar 2018. 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-2018-5233 exists.

Affected packages and fixed versions:
- getgrav/grav (Packagist): affected all versions; fixed in 1.3.0
- getgrav/grav (Packagist): affected all versions; fixed in 1.3.0

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-2018-5233/ (Markdown: https://insights.sbomify.com/CVE-2018-5233/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-5233
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-5233
- OSV: https://osv.dev/vulnerability/CVE-2018-5233

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-5233/
Summaries are generated and may contain mistakes; the official description above is the record.