EUVD-2026-76688
GHSA-pcwm-p48j-jmfv
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/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
PR:L because block-add scope is a standard editorial (not admin) permission; C:L for file URL and thumbnail disclosure; I:L for unauthorized file references rendered on pages; no availability impact.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
2DescriptionCVE.org
Concrete CMS Area API's block-create endpoint in versions 9.2.0 to 9.5.2 did not invoke the block type controller's validate() method on submitted data, which, for file-referencing blocks such as hero_image and gallery, is where the referenced file is authorized against the user's file-manager visibility. As a result, an authenticated user holding the block-add scope could store, and cause the page to render, a reference to a file that the file-manager authorization policy would otherwise reject, disclosing that file's URL and preview to the editor and to visitors of the affected page. Under public file storage, the URL and thumbnail are exposed directly; under private storage, the disclosure is limited by the permission-checked download URL. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.
AnalysisAI
Missing authorization in Concrete CMS 9.2.0-9.5.2 allows authenticated editors holding block-add scope to bypass file-manager visibility controls by exploiting the Area API's block-create endpoint, which never invokes the block type controller's validate() method. For file-referencing block types such as hero_image and gallery, this validate() call is the sole enforcement point for file access authorization - its omission means a restricted file reference can be stored and rendered on any page. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated user account holding the 'block-add' scope within Concrete CMS 9.2.0-9.5.2. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 5.1 with vector PR:H reflects moderate risk, gated behind editorial credentials. … 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, which restores invocation of the block type controller's validate() method on the block-create endpoint, re-enforcing file-manager authorization. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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