Vulnerability-Lookup

CVE-2026-53952 (GCVE-0-2026-53952)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:23 – Updated: 2026-09-14 18:18

Title

GetSimple CMS & GetSimpleCMS-CE have an Unauthenticated Admin Account Creation via Setup Logic Flaw

Summary

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 17:11 UTC

CWE

CWE-285 - Improper Authorization
CWE-306 - Missing Authentication for Critical Function
CWE-489 - Active Debug Code

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/GetSimpleCMS-CE/GetSimpleCMS-C…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version	CPE status
GetSimpleCMS-CE	GetSimpleCMS-CE	Affected: <= 3.3.22	guessed
GetSimpleCMS	GetSimpleCMS	Affected: <= 3.4.0a	guessed

Show details on NVD website

JSON

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FKIE_CVE-2026-53952

Vulnerability from fkie_nvd - Published: 2026-09-11 20:17 - Updated: 2026-09-14 19:17

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-rw2c-w4mg-46g4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "GetSimpleCMS-CE",
          "vendor": "GetSimpleCMS-CE",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 3.3.22"
            }
          ]
        },
        {
          "product": "GetSimpleCMS",
          "vendor": "GetSimpleCMS",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 3.4.0a"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
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    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-53952",
  "lastModified": "2026-09-14T19:17:26.103",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-53952 (GCVE-0-2026-53952)

FKIE_CVE-2026-53952

Tags

Sightings

Nomenclature