CVE-2021-47964Public exploitNetwork attack vector

Authenticated PHP code execution via extension package

Published May 15, 2026 · Updated May 15, 2026

Code injection in SCHLIX CMS 2.2.6-6 allows remote authenticated users to execute arbitrary PHP code through a crafted extension package. The core.blockmanager package installer accepts a ZIP with PHP in packageinfo.inc, and the About-tab path loads that file as executable PHP. A valid account with block-management access and its password is required; successful exploitation permits arbitrary server-side commands.

CVSS severity8.8
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in SCHLIX CMS 2.2.6-6 allows remote authenticated users to execute arbitrary PHP code through a crafted extension package. The core.blockmanager package installer accepts a ZIP with PHP in packageinfo.inc, and the About-tab path loads that file as executable PHP. A valid account with block-management access and its password is required; successful exploitation permits arbitrary server-side commands.

The record

CVE
CVE-2021-47964
Published
May 15, 2026
Updated
May 15, 2026
Vendor
SCHLIX Web Inc
Product
SCHLIX CMS
Classifications
CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 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=2.2.6-6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SCHLIX Web Inc · SCHLIX CMSversion=2.2.6-6

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

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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