# CVE-2026-53952: GetSimple CMS & GetSimpleCMS-CE have an Unauthenticated Admin Account Creation via Setup Logic Flaw

> Unauthenticated attackers can create admin accounts due to a logic flaw preventing the deletion of the setup script after installation.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-rw2c-w4mg-46g4

## What is CVE-2026-53952?

CVE-2026-53952 is a critical authentication bypass vulnerability in GetSimpleCMS, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. A logic flaw in GetSimple CMS (v3.4.0a and below) and GetSimpleCMS-CE (v3.3.22 and below) allows unauthenticated attackers to create a new administrator account. The application features an automated security control designed to delete the sensitive `admin/setup.php` file post-installation. However, this control is neutralized by a self-exclusion bug within the deletion logic, leaving the setup script accessible for unauthorized account creation even after a legitimate installation is completed. As of time of publication, no known patched versions are available.

Weakness: CWE-489 (Active Debug Code), CWE-306 (Missing Authentication for Critical Functionality), CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-53952?


## How do I fix CVE-2026-53952?

No fix has been published for CVE-2026-53952 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-53952 being exploited?

There is no known exploitation of CVE-2026-53952 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53952 and fix it if it is affected.

What it is: CVE-2026-53952 is a critical authentication bypass vulnerability in GetSimpleCMS, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-53952 in the wild and no public exploit code.

Affected product: GetSimpleCMS. 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-2026-53952/ (Markdown: https://insights.sbomify.com/CVE-2026-53952/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53952
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53952
- OSV: https://osv.dev/vulnerability/CVE-2026-53952

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53952/
Summaries are generated and may contain mistakes; the official description above is the record.