# CVE-2023-47621: Remote code execution via file uploads in guest-entries

> Authenticated users can upload PHP files to execute arbitrary code on the server due to missing file type restrictions in the guest-entries library.

- **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:** 13 Nov 2023
- **Updated:** 3 Sep 2024
- **Also known as:** GHSA-rw82-mhmx-grmj

## What is CVE-2023-47621?

CVE-2023-47621 is a high-severity vulnerability in duncanmcclean guest-entries, published on 13 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Guest Entries is a php library which allows users to create, update & delete entries from the front-end of a site. In affected versions the file uploads feature did not prevent the upload of PHP files. This may lead to code execution on the server by authenticated users. This vulnerability is fixed in v3.1.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2023-47621?

4 open source packages ship an affected version, including duncanmcclean/guest-entries and doublethreedigital/guest-entries. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `duncanmcclean/guest-entries` | Packagist | All versions | 3.1.2 |
| `duncanmcclean/guest-entries` | Packagist | All versions | 3.1.2 |
| `doublethreedigital/guest-entries` | Packagist | All versions | 3.1.2 |
| `doublethreedigital/guest-entries` | Packagist | All versions | 3.1.2 |

Products: Duncanmcclean Guest Entries.

## How do I fix CVE-2023-47621?

Upgrade duncanmcclean/guest-entries to 3.1.2 or later.

## Is CVE-2023-47621 being exploited?

There is no known exploitation of CVE-2023-47621 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-47621 and fix it if it is affected.

What it is: CVE-2023-47621 is a high-severity vulnerability in duncanmcclean guest-entries, published on 13 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-47621 in the wild and no public exploit code.

Affected packages and fixed versions:
- duncanmcclean/guest-entries (Packagist): affected all versions; fixed in 3.1.2
- duncanmcclean/guest-entries (Packagist): affected all versions; fixed in 3.1.2
- doublethreedigital/guest-entries (Packagist): affected all versions; fixed in 3.1.2
- doublethreedigital/guest-entries (Packagist): affected all versions; fixed in 3.1.2

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-2023-47621/ (Markdown: https://insights.sbomify.com/CVE-2023-47621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-47621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-47621
- OSV: https://osv.dev/vulnerability/CVE-2023-47621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-47621/
Summaries are generated and may contain mistakes; the official description above is the record.