# CVE-2026-28495: GetSimple CMS has CSRF to Remote Code Execution via Arbitrary PHP Write in gsconfig.php

> A CSRF vulnerability in the massiveAdmin plugin allows attackers to force admins to write arbitrary PHP code, leading to remote code execution.

- **Severity:** Critical 9.7 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 10 Mar 2026
- **Updated:** 10 Mar 2026
- **Also known as:** GHSA-92wv-q2jp-qg88

## What is CVE-2026-28495?

CVE-2026-28495 is a critical vulnerability in GetSimpleCMS-CE, published on 10 Mar 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

GetSimple CMS is a content management system. The massiveAdmin plugin (v6.0.3) bundled with GetSimpleCMS-CE v3.3.22 allows an authenticated administrator to overwrite the gsconfig.php configuration file with arbitrary PHP code via the gsconfig editor module. The form lacks CSRF protection, enabling a remote unauthenticated attacker to exploit this via Cross-Site Request Forgery against a logged-in admin, achieving Remote Code Execution (RCE) on the web server.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-28495?

It affects 1 product.


Products: Getsimple-Ce Getsimple Cms.

## How do I fix CVE-2026-28495?

No fix has been published for CVE-2026-28495 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-28495 being exploited?

There is no known exploitation of CVE-2026-28495 in the wild and no public exploit code.

## Other vulnerabilities in GetSimpleCMS-CE

- [CVE-2024-55085](https://insights.sbomify.com/CVE-2024-55085/): Code injection in n/a (critical 9.8)
- [CVE-2026-27202](https://insights.sbomify.com/CVE-2026-27202/): GetSimple CMS: Uploaded Files (feature) Arbitrary File Read Vulnerability (high 8.8)
- [CVE-2024-55088](https://insights.sbomify.com/CVE-2024-55088/): Server-side request forgery in n/a (high 8.8)
- [CVE-2026-27161](https://insights.sbomify.com/CVE-2026-27161/): Unauthenticated Information Disclosure via .htaccess Reliance in Sensitive Directories (high 8.7)
- [CVE-2025-48492](https://insights.sbomify.com/CVE-2025-48492/): GetSimple CMS RCE in Edit component (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-28495 and fix it if it is affected.

What it is: CVE-2026-28495 is a critical vulnerability in GetSimpleCMS-CE, published on 10 Mar 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-2026-28495 in the wild and no public exploit code.

Affected product: GetSimpleCMS-CE. 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-2026-28495/ (Markdown: https://insights.sbomify.com/CVE-2026-28495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-28495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-28495
- OSV: https://osv.dev/vulnerability/CVE-2026-28495

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-28495/
Summaries are generated and may contain mistakes; the official description above is the record.