# CVE-2024-27923: Remote Code Execution by uploading a phar file using frontmatter

> Attackers can achieve remote code execution by uploading malicious phar files via the frontmatter feature due to insufficient validation.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 6 Mar 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-f6g2-h7qv-3m5v

## What is CVE-2024-27923?

CVE-2024-27923 is a high-severity vulnerability in Getgrav Grav, published on 6 Mar 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Grav is a content management system (CMS). Prior to version 1.7.43, users who may write a page may use the `frontmatter` feature due to insufficient permission validation and inadequate file name validation. This may lead to remote code execution. Version 1.7.43 fixes this issue.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2024-27923?

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 | 1.7.43 |
| `getgrav/grav` | Packagist | All versions | 1.7.43 |

Products: Getgrav Grav.

## How do I fix CVE-2024-27923?

Upgrade getgrav/grav to 1.7.43 or later.

## Is CVE-2024-27923 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-27923 exists.

## Other vulnerabilities in Getgrav Grav

- [CVE-2023-34251](https://insights.sbomify.com/CVE-2023-34251/): Grav Server Side Template Injection vulnerability (critical 10.0)
- [CVE-2025-46199](https://insights.sbomify.com/CVE-2025-46199/): Cross-site scripting in n/a (critical 9.8)
- [CVE-2021-47812](https://insights.sbomify.com/CVE-2021-47812/): GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) (critical 9.3)
- [CVE-2025-66844](https://insights.sbomify.com/CVE-2025-66844/): Grav may be vulnerable to SSRF attack via Twig Templates (critical 9.1)
- [CVE-2022-2073](https://insights.sbomify.com/CVE-2022-2073/): Code Injection in getgrav/grav (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-27923 and fix it if it is affected.

What it is: CVE-2024-27923 is a high-severity vulnerability in Getgrav Grav, published on 6 Mar 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-27923 exists.

Affected packages and fixed versions:
- getgrav/grav (Packagist): affected all versions; fixed in 1.7.43
- getgrav/grav (Packagist): affected all versions; fixed in 1.7.43

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-2024-27923/ (Markdown: https://insights.sbomify.com/CVE-2024-27923/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-27923
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-27923
- OSV: https://osv.dev/vulnerability/CVE-2024-27923

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-27923/
Summaries are generated and may contain mistakes; the official description above is the record.