CVE-2026-56662Public exploitNetwork attack vectorHinoki check available

Remote code execution via forged update request

Published Oct 1, 2026 · Updated Oct 1, 2026

CSRF in GetSimple CMS Community Edition's UpdateCE plugin before 1.5 allows remote attackers to execute code via a forged update request. The UpdateCE form supplies no anti-CSRF token, and its POST handler accepts a download URL without token or origin verification, then extracts and deploys the fetched archive. An authenticated administrator must visit an attacker-controlled page; its auto-submitted request uses that session to deploy executable content.

CVSS severity9.6
Critical
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

CSRF in GetSimple CMS Community Edition's UpdateCE plugin before 1.5 allows remote attackers to execute code via a forged update request. The UpdateCE form supplies no anti-CSRF token, and its POST handler accepts a download URL without token or origin verification, then extracts and deploys the fetched archive. An authenticated administrator must visit an attacker-controlled page; its auto-submitted request uses that session to deploy executable content.

The record

CVE
CVE-2026-56662
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
GetSimpleCMS-CE
Product
GetSimple CMS Community Edition
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

GetSimpleCMS-CE · GetSimple CMS Community Editionversion=< 1.5

Published CVSS scores

9.6GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

Public exploit references

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

Technologies

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