Auth bypass in Concretecms Concrete Cms
CVE-2021-22966
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
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (60.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.000
Affected products
- Concretecms Concrete Cms
- Https://github.com/concrete5/concrete5 — versions Fixed in version 9 and in version 8.5.7
Weakness classification (CWE)
References
- documentation.concretecms.org/developers/introduction/version-history/857-relea… (Release Notes, Vendor Advisory)
- hackerone.com/reports/1362747 (Permissions Required)
Frequently asked questions
- What is CVE-2021-22966?
- CVE-2021-22966 is a high-severity vulnerability in Concretecms Concrete Cms, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2021-11-19.
- How severe is CVE-2021-22966?
- High severity. CVSS v3 base score is 8.8 out of 10.