EUVD-2026-76246
GHSA-7vqm-7j76-2jjr
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 requires victim interaction (UI:R); attacker needs no privileges; only low integrity impact from duplicate record creation with no scope change.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
1DescriptionCVE.org
Concrete CMS before 9.5.3 did not validate an anti-CSRF token in the Calendar event duplicate dialog controller (concrete/controllers/dialog/event/duplicate.php) submit() action, which duplicated a calendar event after checking only canAccess() and the per-resource canAddCalendarEvent() permission, so a crafted cross-site request could cause an authenticated user with add-event permission to create duplicate CalendarEvents and CalendarEventVersions records under their own authority. 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
Missing CSRF token validation in Concrete CMS before 9.5.3 allows a remote attacker to trick an authenticated calendar editor into silently creating unwanted duplicate events. The vulnerable endpoint - the Calendar event duplicate dialog's submit() action in concrete/controllers/dialog/event/duplicate.php - enforced only object-level permissions (canAccess() and canAddCalendarEvent()) without verifying an anti-CSRF synchronizer token, meaning any forged cross-site request submitted on behalf of a legitimate session could produce spurious CalendarEvent and CalendarEventVersions database records. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following: (1) the Concrete CMS installation is running a version earlier than 9.5.3; (2) the victim has an active authenticated session in the same browser at the time of attack; and (3) the victim's account holds the canAddCalendarEvent() permission on at least one calendar resource. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N) accurately reflects the bounded risk profile: integrity-only impact at low severity, contingent on user interaction. … 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, which introduces proper anti-CSRF token validation in the Calendar event duplicate dialog submit() action. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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