EUVD-2026-75706
GHSA-72w5-w82m-7hm9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-delivered CSRF with mandatory victim interaction (UI:R); attacker needs no CMS credentials (PR:N); integrity impact limited to victim-authorized boards (I:L), no confidentiality or availability impact.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
1DescriptionCVE.org
Concrete CMS 9 through 9.5.2 did not validate an anti-CSRF token in the Boards custom slot dialog controller (concrete/controllers/dialog/board/custom_slot.php) saveTemplate() action. The action created a board_slot_proxy Block and dispatched an AddCustomSlotToBoardCommand against a board instance while gating only on the per-resource canEditBoardContents() permission, so a crafted cross-site request could cause a user holding board-edit permission with an active session to write attacker-chosen slot and template data to a board under their own authority. The state-changing database write completed before any downstream rendering, so the forged request succeeded even when the HTTP response returned a non-200 status. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
AnalysisAI
Cross-site request forgery in Concrete CMS 9.x through 9.5.2 allows an unauthenticated attacker to forge board-content modifications on behalf of any authenticated user who holds board-edit permission. The saveTemplate() action in the Boards custom slot dialog controller omits anti-CSRF token validation, permitting a crafted HTTP request to write attacker-controlled slot and template data to a board under the victim's authority. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim holds the canEditBoardContents() permission on at least one board within the target Concrete CMS 9.x through 9.5.2 installation and maintains an active authenticated browser session at the time of the forged request. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N is well-calibrated for this class of vulnerability - the integrity impact is bounded by the victim's own board-edit permissions, preventing any cross-user or privilege-escalating abuse. … 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, the vendor-released patch confirmed by the 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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