# CVE-2026-71426: GetSimple CMS: Authenticated Stored Local File Inclusion (LFI) via page "template" field

> Authenticated users can exploit a path traversal flaw in GetSimple CMS to include arbitrary local files, potentially leading to remote code execution.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **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:** 1 Oct 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-559q-hqrv-m84x

## What is CVE-2026-71426?

CVE-2026-71426 is a high-severity path traversal vulnerability in GetSimpleCMS-CE, published on 1 Oct 2026. Any signed-in user can exploit it over the network, 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. In versions 3.3.22 and prior, an authenticated user with page-editing rights can store an arbitrary filesystem path in a page's template attribute. On the public front-end, this value is passed unsanitized to a PHP include() when the page is rendered. Because the include path is never confined, this allows directory-traversal Local File Inclusion: arbitrary local files are included (and, if they contain PHP, executed) when any visitor requests the page. At time of publication, there are no publicly available patches.

Weakness: CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-71426?


## How do I fix CVE-2026-71426?

No fix has been published for CVE-2026-71426 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-71426 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-71426 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-71426 and fix it if it is affected.

What it is: CVE-2026-71426 is a high-severity path traversal vulnerability in GetSimpleCMS-CE, published on 1 Oct 2026. 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-2026-71426 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-2026-71426/ (Markdown: https://insights.sbomify.com/CVE-2026-71426/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-71426
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71426
- OSV: https://osv.dev/vulnerability/CVE-2026-71426

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-71426/
Summaries are generated and may contain mistakes; the official description above is the record.