CVE-2026-56660Public exploitNetwork attack vectorHinoki check available

Remote code execution via unchecked update archive extraction

Published Oct 1, 2026 · Updated Oct 1, 2026

Unrestricted ZIP extraction in UpdateCE before 1.5 for GetSimple CMS Community Edition allows remote authenticated users to execute PHP. The update handler copies archive entries into the web root without restricting file types or validating extraction paths, allowing PHP deployment and writes outside the intended directory. Direct exploitation requires an administrator to submit an attacker-controlled update URL; separately tracked flaws can supply an indirect attack chain.

CVSS severity9.1
Critical
EPSS probability0.53%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Unrestricted ZIP extraction in UpdateCE before 1.5 for GetSimple CMS Community Edition allows remote authenticated users to execute PHP. The update handler copies archive entries into the web root without restricting file types or validating extraction paths, allowing PHP deployment and writes outside the intended directory. Direct exploitation requires an administrator to submit an attacker-controlled update URL; separately tracked flaws can supply an indirect attack chain.

The record

CVE
CVE-2026-56660
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
GetSimpleCMS-CE
Product
GetSimple CMS Community Edition
Classifications
CWE-22, CWE-434, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=< 1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

GetSimpleCMS-CE · GetSimple CMS Community Editionversion=< 1.5

Published CVSS scores

9.1GetSimpleCMS-CECVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

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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