CVE-2026-27146Public exploitNetwork attack vector

Arbitrary file uploads via missing CSRF validation

Published Feb 20, 2026 · Updated Feb 20, 2026

CSRF in GetSimple CMS Community Edition 3.3.22 and earlier allows attackers to upload arbitrary files through an authenticated browser. The admin/upload.php endpoint accepts cross-origin authenticated POST requests without a CSRF token or Origin validation. Exploitation requires an authenticated administrator to visit an attacker-controlled page, enabling persistent content hosting, storage abuse, or defacement.

CVSS severity4.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in GetSimple CMS Community Edition 3.3.22 and earlier allows attackers to upload arbitrary files through an authenticated browser. The admin/upload.php endpoint accepts cross-origin authenticated POST requests without a CSRF token or Origin validation. Exploitation requires an authenticated administrator to visit an attacker-controlled page, enabling persistent content hosting, storage abuse, or defacement.

The record

CVE
CVE-2026-27146
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
GetSimpleCMS-CE
Product
GetSimple CMS Community Edition
Classifications
CWE-434, CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 3.3.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GetSimpleCMS-CE · GetSimple CMS Community Editionversion=<= 3.3.22

Published CVSS scores

7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
4.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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