# CVE-2026-56662: GetSimple CMS CE cross-site request forgery in UpdateCE

Source: https://junglewise.ai/threats/cve-2026-56662-getsimple-cms-is-a-content-management-system-cms-and-getsimple  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-01. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-56662 · Severity: critical · CVSS 9.6 · Published 2026-10-01

GetSimple CMS is a content management system used to build and manage websites. An attacker can trick an authenticated administrator into visiting a malicious webpage that secretly instructs their browser to download and deploy attacker-controlled code, resulting in complete system compromise and remote code execution. No special access or authentication by the attacker is required.

Technologies: [GetSimple CMS CE](https://junglewise.ai/threats/technologies/getsimple-cms-ce). Vendors: [GetSimple](https://junglewise.ai/threats/vendors/getsimple).

## Quick answers

**Is CVE-2026-56662 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56662 being exploited in the wild.

**How severe is CVE-2026-56662?** Critical severity, with a CVSS score of 9.6, published 1 October 2026.

**Which products and versions are affected?** GetSimple CMS CE prior to 1.5.

**Is there a fix for CVE-2026-56662?** Yes: fixed in 1.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-56662 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-56662?** Check whether you run GetSimple CMS CE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.5

## Technical details

The UpdateCE plugin in GetSimple CMS CE versions prior to 1.5 lacks CSRF protection and token verification on its form handler. An attacker can craft a webpage that auto-submits a POST request to the update endpoint; when an authenticated administrator visits it, the server executes the forged update operation in the administrator's session. The url field is also written unescaped into the form, providing an additional HTML-injection vector via a malicious upgrade.json.

## Affected products

- GetSimple CMS CE prior to 1.5

## Timeline

- 2026-07-06: disclosed
- 2026-10-01: advisory

## References

- [https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-2rxv-4g4m-573w](https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-2rxv-4g4m-573w)

## Related threats

- [GetSimple CMS stored XSS in backup viewer](https://junglewise.ai/threats/cve-2026-70650-getsimple-cms-is-a-content-management-system-cms-and-getsimple)
- [GetSimple CMS server-side request forgery in update handler](https://junglewise.ai/threats/cve-2026-56661-getsimple-cms-is-a-content-management-system-cms-and-getsimple)
- [GetSimple CMS unrestricted ZIP extraction in UpdateCE plugin](https://junglewise.ai/threats/cve-2026-56660-getsimple-cms-is-a-content-management-system-cms-and-getsimple)
- [GetSimple CMS password reset authentication bypass](https://junglewise.ai/threats/cve-2026-53953-getsimple-cms-is-a-content-management-system-cms-and-getsimple)
- [GetSimple CMS unauthenticated admin account creation via setup script](https://junglewise.ai/threats/cve-2026-53952-getsimple-cms-unauthenticated-admin-account-creation-via-setup)