# CVE-2023-6887: saysky ForestBlog Image Upload img unrestricted upload

> Remote attackers can upload malicious files via the image upload handler, potentially leading to code execution on the server.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Dec 2023
- **Updated:** 27 Aug 2024
- **Also known as:** GHSA-gq4q-38gx-v325

## What is CVE-2023-6887?

CVE-2023-6887 is a medium-severity vulnerability in saysky ForestBlog, published on 17 Dec 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability classified as critical has been found in saysky ForestBlog up to 20220630. This affects an unknown part of the file /admin/upload/img of the component Image Upload Handler. The manipulation of the argument filename leads to unrestricted upload. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-248247.

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

## Which versions are affected by CVE-2023-6887?

It affects 1 product.


Products: Forestblog Project Forestblog.

## How do I fix CVE-2023-6887?

No fix has been published for CVE-2023-6887 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6887 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-6887 exists.

## Other vulnerabilities in saysky ForestBlog

- [CVE-2021-46033](https://insights.sbomify.com/CVE-2021-46033/): File upload in n/a (critical 9.8)
- [CVE-2020-18964](https://insights.sbomify.com/CVE-2020-18964/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2022-29020](https://insights.sbomify.com/CVE-2022-29020/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2021-46034](https://insights.sbomify.com/CVE-2021-46034/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2025-3004](https://insights.sbomify.com/CVE-2025-3004/): Sayski ForestBlog search cross site scripting (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6887 and fix it if it is affected.

What it is: CVE-2023-6887 is a medium-severity vulnerability in saysky ForestBlog, published on 17 Dec 2023. 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-2023-6887 exists.

Affected product: saysky ForestBlog. 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-2023-6887/ (Markdown: https://insights.sbomify.com/CVE-2023-6887/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6887
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6887
- OSV: https://osv.dev/vulnerability/CVE-2023-6887

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6887/
Summaries are generated and may contain mistakes; the official description above is the record.