High severity · published Nov 19, 2021
CVE-2021-22966
Privilege escalation from Editor to Admin using Groups in Concrete CMS versions 8.5.6 and below
8.8
CVSS
1%
EPSS
No
On KEV
Description
Privilege escalation from Editor to Admin using Groups in Concrete CMS versions 8.5.6 and below. If a group is granted "view" permissions on the bulkupdate page, then users in that group can escalate to being an administrator with a specially crafted curl. Fixed by adding a check for group permissions before allowing a group to be moved. Concrete CMS Security team CVSS scoring: 7.1 AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:HCredit for discovery: "Adrian Tiron from FORTBRIDGE ( https://www.fortbridge.co.uk/ )"This fix is also in Concrete version 9.0.0
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Concrete Cms · Concretecms
before 8.5.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22966
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22966
Release Notes
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes
Permissions Required
https://hackerone.com/reports/1362747
More from Concrete Cms
9.8
CVE-2023-48648
Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because directories can be created with insecure permissions
9.8
CVE-2022-21829
Concrete CMS Versions 9.0.0 through 9.0.2 and 8.5.7 and below can download zip files over HTTP and execute code from those zip files which could lead to an RCE
9.8
CVE-2021-22958
A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost…
9.8
CVE-2021-40098
An issue was discovered in Concrete CMS through 8.5.5
9.6
CVE-2026-85385
Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field