CVE-2021-22966 json
Improper Privilege Management in Concrete CMS
published 2021-11-19 4 y ago modified 2026-06-17 4 mo ago also GHSA-j4mv-2rv7-v2j9 , EUVD-2021-2360
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- packagist concrete5/core 8.5.7
- concretecms concrete_cms 8.5.7
Exploit prediction
0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
| GitHub | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | concrete5/core | <8.5.7 |
8.5.7 |
Affected products
- n/a https://github.com/concrete5/concrete5
Classification
References
-
documentation.concretecms.org
/developers/introduction/version-history/857-release-notes
web, release-notes, vendor-advisory
-
hackerone.com
/reports/1362747
web, permissions-required
-
nvd.nist.gov
/vuln/detail/CVE-2021-22966
advisory
Sources
- CVE List CVE-2021-22966
- GitHub Advisory GHSA-j4mv-2rv7-v2j9
- NVD CVE-2021-22966
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.