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
References (2)
Core 2
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes
Permissions Required x_refsource_misc
https://hackerone.com/reports/1362747
Scores
CVSS v3
8.8
EPSS
0.0095
EPSS Percentile
56.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-863
Status
published
Products (2)
concrete5/core
0 - 8.5.7Packagist
concretecms/concrete_cms
< 8.5.7
Published
Nov 19, 2021
Tracked Since
Feb 18, 2026