EUVD-2026-80882
GHSA-82fx-23wg-996j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/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 endpoint but attacker must hold a valid users:add-scoped OAuth token (PR:L); creating accounts is an integrity-only impact (I:L), no confidentiality or availability loss.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
1DescriptionCVE.org
n Concrete CMS 9.2.0 through 9.5.3, the REST API user creation endpoint (POST /ccm/api/1.0/users, the add() method of concrete/src/Api/Controller/Users.php) did not perform a permission check before creating an account. As a result, any valid OAuth token carrying the users:add scope, including a client_credentials token with no associated user context, could create active, validated user accounts, bypassing email verification and administrator approval. Under default registration settings the created accounts could then edit page content, providing a path to stored cross-site scripting and further compromise. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
AnalysisAI
Concrete CMS 9.2.0 through 9.5.3 fails to enforce an authorization check on its REST API user-creation endpoint (POST /ccm/api/1.0/users), so any request bearing a valid OAuth token that carries the users:add scope - including a client_credentials token with no associated user context - can create active, validated accounts while bypassing email verification and administrator approval. The endpoint's add() method in concrete/src/Api/Controller/Users.php performs no permission verification, making this a classic missing-authorization weakness (CWE-862) that an authenticated API consumer can abuse to gain a foothold. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires possession of a valid OAuth token carrying the users:add scope (including a client_credentials token with no associated user) - the endpoint fails to verify that the token's context is authorized to create users. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but low-severity authorization flaw (CWE-862): the REST API endpoint POST /ccm/api/1.0/users invoked Users.php add() without a permission check, so any OAuth token bearing the users:add scope - even a client_credentials token with no user context - could mint active, email-verified, admin-approved accounts. … 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 | Vendor-released patch: Concrete CMS 9.5.4 - upgrade from any 9.2.0-9.5.3 installation to 9.5.4 or later, as documented in the 9.5.4 release notes at https://documentation.concretecms.org/developers/introduction/version-history/954-release-notes. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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