# CVE-2026-53691: Remote Code Execution in Redeight CMS

> Authenticated attackers can upload arbitrary PHP scripts to achieve remote code execution due to missing file validation in Redeight CMS.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L`)
- **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:** No
- **Published:** 30 Jun 2026
- **Updated:** 30 Jun 2026
- **Also known as:** GHSA-gxmr-q5p5-p9w5

## What is CVE-2026-53691?

CVE-2026-53691 is a high-severity vulnerability in Redeight CMS, published on 30 Jun 2026. 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

An Unrestricted File Upload vulnerability in Redeight CMS version 1.0 allows authenticated attackers to achieve Remote Code Execution via the POST "/admin/index.php?module=pages&mode=FileAdd" endpoint. The application fails to validate file extensions and MIME types, permitting the upload of arbitrary PHP scripts to the publicly accessible "/uploads/files/" directory where they can be executed directly by the web server.

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

## Which versions are affected by CVE-2026-53691?


## How do I fix CVE-2026-53691?

No fix has been published for CVE-2026-53691 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-53691 being exploited?

There is no known exploitation of CVE-2026-53691 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53691 and fix it if it is affected.

What it is: CVE-2026-53691 is a high-severity vulnerability in Redeight CMS, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-53691 in the wild and no public exploit code.

Affected product: Redeight CMS. 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-2026-53691/ (Markdown: https://insights.sbomify.com/CVE-2026-53691/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53691
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53691
- OSV: https://osv.dev/vulnerability/CVE-2026-53691

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53691/
Summaries are generated and may contain mistakes; the official description above is the record.