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TI-2026-21596 Aliases CVE-2026-27146

GetSimple CMS: Cross-Site Request Forgery (CSRF) in File Upload Allows Arbitrary Uploads

Priority MEDIUM 64CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Tampering, Code execution
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-352 and CWE-434.

Summary

GetSimple CMS is a content management system. All versions of GetSimple CMS do not implement CSRF protection on the administrative file upload endpoint. As a result, an attacker can craft a malicious web page that silently triggers a file upload request from an authenticated victim’s browser. The request is accepted without requiring a CSRF token or origin validation. This allows an attacker to upload arbitrary files to the application without the victim’s knowledge or consent. In order to exploit this vulnerability, the victim must be authenticated to GetSimple CMS (e.g., admin user), and visit an attacker-controlled webpage. This issue does not have a fix at the time of publication.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00201 10th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GetSimpleCMS-CEGetSimpleCMS-CEup to 3.3.22—No fix listedCNA
  • GetSimpleCMS-CE VendorGetSimpleCMS-CE Affected up to 3.3.22 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:getsimple-ce:getsimple_cms:*:*:*:*:community:*:*:*up to 3.3.22VulnerableGetSimpleCMS-CE
  • cpe:2.3:a:getsimple-ce:getsimple_cms:*:*:*:*:community:*:*:* Versions up to 3.3.22 Vulnerable ·GetSimpleCMS-CE

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27146

References

Exploit 1

  • TI-2024-36775 GetSimple CMS CE 3.3.19 suffers from arbitrary code execution in the template editing… CVSS 3.1CRITICAL 9.8
  • TI-2025-30771 GetSimple CMS RCE in Edit component CVSS 4.0HIGH 8.6
  • TI-2024-36777 GetSimple CMS CE 3.3.19 is vulnerable to Server-Side Request Forgery (SSRF) in the backend plugin module. CVSS 3.1HIGH 8.8
  • TI-2026-21637 GetSimple CMS: Uploaded Files (feature) Arbitrary File Read Vulnerability CVSS 4.0HIGH 8.8
  • TI-2026-21606 Unauthenticated Information Disclosure via .htaccess Reliance in Sensitive Directories CVSS 4.0HIGH 8.7
  • TI-2024-36776 In the GetSimple CMS CE 3.3.19 management page, Server-Side Request Forgery (SSRF) can be… CVSS 3.1HIGH 7.2
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences