Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Concrete CMS | Concrete CMS | unaffected |
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Tracking
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Wed, 16 Sep 2026 16:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Missing authorization in the REST API user creation endpoint in Concrete CMS 9.2.0 through 9.5.3 allows arbitrary account creation | |
| Weaknesses | CWE-862 | |
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cvssV4_0
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: ConcreteCMS
Published:
Updated: 2026-09-16T16:40:04.774Z
Reserved: 2026-09-08T18:13:52.425Z
Link: CVE-2026-87031
Vulnrichment
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NVD
Status : Received
Published: 2026-09-16T17:18:16.703
Modified: 2026-09-16T17:18:16.703
Link: CVE-2026-87031
Redhat
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OpenCVE Enrichment
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