EUVD-2026-76160
GHSA-865j-87f7-7r6w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable REST API, authenticated low-privilege attacker with specific token scope required (PR:L), read-only high confidentiality impact, no scope change or integrity/availability effect.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
3DescriptionCVE.org
Concrete CMS 9.2.0 to 9.5.2 contain a missing authorization vulnerability in the REST API Groups list endpoint. The listGroups() method in concrete/src/Api/Controller/Groups.php registers a permissions checker callback that unconditionally returns true, so no per-object (tree node) authorization is enforced when the group collection is returned. An authenticated user whose API token carries the groups:read scope can call GET /ccm/api/1.0/groups and receive every group on the site regardless of the view permissions on those groups, disclosing the organization's group structure, roles, and access hierarchy. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
AnalysisAI
Unauthorized group enumeration in Concrete CMS 9.2.0 through 9.5.2 exposes the full organizational group structure to any authenticated API user holding a groups:read token. The root cause is a permission-checker callback in the REST API Groups controller that unconditionally returns true, eliminating per-object (tree-node) authorization on the group collection endpoint. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a valid API authentication token issued by the target Concrete CMS instance; (2) that token must explicitly carry the groups:read OAuth scope - this is not automatically assigned to all authenticated users and represents a concrete prerequisite; (3) the REST API must be enabled and network-accessible on the deployment; and (4) the target must be running Concrete CMS 9.2.0 through 9.5.2. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N accurately captures the threat profile: network-reachable, low-privilege attacker, high confidentiality impact on the vulnerable system, but no integrity or availability effect. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Concrete CMS 9.5.3 or later; the 9.5.3 release notes at https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes confirm the authorization fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
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