CVE-2021-22966Network attack vector

Editor-to-Administrator escalation via unchecked group move

Published Nov 19, 2021 · Updated Aug 3, 2024

Privilege escalation in Concrete CMS 8.5.6 and earlier allows remote authenticated users to become administrators through the bulkupdate page. The bulk-update handler moves a group without checking whether the requesting user has permission to modify that group. An Editor must belong to a group that can view the page; a crafted HTTP request can then grant full administrative control.

CVSS severity7.1
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Concrete CMS 8.5.6 and earlier allows remote authenticated users to become administrators through the bulkupdate page. The bulk-update handler moves a group without checking whether the requesting user has permission to modify that group. An Editor must belong to a group that can view the page; a crafted HTTP request can then grant full administrative control.

The record

CVE
CVE-2021-22966
Published
Nov 19, 2021
Updated
Aug 3, 2024
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-863, CWE-269, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=Fixed in version 9 and in version 8.5.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Concrete CMS · Concrete CMSversion=Fixed in version 9 and in version 8.5.7

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1Concrete CMS Security TeamCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-269Improper Privilege Management
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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