High severity8.8NVD Advisory· Published Nov 19, 2021· Updated Jun 17, 2026
CVE-2021-22966
CVE-2021-22966
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
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
concrete5/corePackagist | < 8.5.7 | 8.5.7 |
Affected products
3- Concrete CMS/Concrete CMSdescription
Patches
Vulnerability mechanics
References
4- documentation.concretecms.org/developers/introduction/version-history/857-release-notesnvdRelease NotesVendor AdvisoryWEB
- github.com/advisories/GHSA-j4mv-2rv7-v2j9ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-22966ghsaADVISORY
- hackerone.com/reports/1362747nvdPermissions RequiredWEB
News mentions
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