Critical · CVSS 9.6CVE-2026-56662

GetSimple CMS: Missing CSRF protection in UpdateCE allows forging a privileged server-side update request

Answer in brief

CVE-2026-56662 records a Critical severity (CVSS 9.6) vulnerability in GetSimple CMS: Missing CSRF protection in UpdateCE allows forging a privileged server-side update request. The current sources do not mark it as known exploited. The current feed maps GetSimpleCMS-CE/GetSimpleCMS-CE (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps GetSimpleCMS-CE/GetSimpleCMS-CE (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
GetSimpleCMS-CE/GetSimpleCMS-CEgeneric	<1.5	1.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for GetSimpleCMS-CE/GetSimpleCMS-CE.
Review the reported fix. Update GetSimpleCMS-CE/GetSimpleCMS-CE to 1.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. Prior to version 1.5, the UpdateCE update form contained no anti-CSRF token, and the POST handler performed no token or request-origin verification. A remote attacker can host a page that auto-submits a forged POST to the update endpoint; when an authenticated administrator visits it, the server performs an attacker-directed download-and-deploy operation in the administrator's session — with no further interaction. Because the deployed content is executed (see the related ZIP-extraction advisory), this yields remote code execution. The url field is additionally written into the form unescaped, providing a secondary HTML-injection sink via a malicious upgrade.json. This issue has been patched in version 1.5.

Quoted source text, attributed separately from HOL analysis.