# CVE-2026-27146: GetSimple CMS: Cross-Site Request Forgery (CSRF) in File Upload Allows Arbitrary Uploads

> Attackers can trick authenticated admins into uploading arbitrary files via CSRF, potentially leading to code execution.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **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:** 20 Feb 2026
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-26rv-8wpp-q84r

## What is CVE-2026-27146?

CVE-2026-27146 is a high-severity vulnerability in GetSimpleCMS-CE, published on 20 Feb 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. All versions of GetSimple CMS do not implement CSRF protection on the administrative file upload endpoint. As a result, an attacker can craft a malicious web page that silently triggers a file upload request from an authenticated victim’s browser. The request is accepted without requiring a CSRF token or origin validation. This allows an attacker to upload arbitrary files to the application without the victim’s knowledge or consent. In order to exploit this vulnerability, the victim must be authenticated to GetSimple CMS (e.g., admin user), and visit an attacker-controlled webpage. This issue does not have a fix at the time of publication.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-27146?

It affects 1 product.


Products: Getsimple-Ce Getsimple Cms.

## How do I fix CVE-2026-27146?

No fix has been published for CVE-2026-27146 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27146 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27146 exists.

## Other vulnerabilities in GetSimpleCMS-CE

- [CVE-2024-55085](https://insights.sbomify.com/CVE-2024-55085/): Code injection in n/a (critical 9.8)
- [CVE-2026-28495](https://insights.sbomify.com/CVE-2026-28495/): GetSimple CMS has CSRF to Remote Code Execution via Arbitrary PHP Write in gsconfig.php (critical 9.7)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27146 and fix it if it is affected.

What it is: CVE-2026-27146 is a high-severity vulnerability in GetSimpleCMS-CE, published on 20 Feb 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27146 exists.

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-2026-27146/ (Markdown: https://insights.sbomify.com/CVE-2026-27146/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27146
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27146
- OSV: https://osv.dev/vulnerability/CVE-2026-27146

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27146/
Summaries are generated and may contain mistakes; the official description above is the record.