EUVD-2026-76168
GHSA-9xmc-5q7j-x4fm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/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
Area-scoped editor delegation is a low-privilege role (PR:L not admin); content disclosure via duplication (C:H) is missed by vendor; block destruction maps to I:H and A:H.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
2DescriptionCVE.org
Concrete CMS 9 through 9.5.2 is vulnerable to Missing Authorization in the block alias route (Process::alias() in concrete/controllers/backend/block/process.php).It does not verify that the referenced block is genuinely orphaned on the target page, nor that the caller holds any permission over the source block. A user granted only an area-scoped add_block_to_area delegation on their own page can therefore pass any block ID on the site: the source block's content is duplicated into an area the rogue editor controls, disclosing that content, and the original block is then force-deleted in the same request, destroying arbitrary site content. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.9 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.
AnalysisAI
Missing authorization in the block alias route of Concrete CMS 9.x through 9.5.2 allows an authenticated editor holding only a limited area-scoped add_block_to_area delegation to read and permanently destroy arbitrary block content across the entire site. The vulnerable method Process::alias() in concrete/controllers/backend/block/process.php accepts caller-supplied block IDs without verifying ownership over the source block or confirming it is genuinely orphaned on the caller's page, enabling cross-page content theft via duplication and forced silent deletion of the original. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Concrete CMS user account with at least area-scoped add_block_to_area delegation on any page within the installation - this is a specific editorial permission granted by an administrator and is not held by all authenticated users or anonymous visitors. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor assigned a CVSS 4.0 score of 5.9 (Medium) with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N. … 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 Concrete CMS to version 9.5.3 or later, as indicated by the vendor's 9.5.3 release notes at https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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