EUVD-2026-76243
GHSA-gpgr-mxq3-f5p5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:N/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
Attacker needs no privileges (CSRF exploits victim's session); victim admin must be tricked into visiting malicious content (UI:R); unauthorized group relocation produces high integrity impact with indirect, limited confidentiality exposure.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
1DescriptionCVE.org
Concrete CMS before 9.5.3 is vulnerable to Cross-Site Request Forgery in the Move Multiple Groups feature. The dashboard/users/groups/bulkupdate/confirm() endpoint moved the selected group tree nodes without validating an action token, so a state-changing group move could be processed for an authenticated user who did not initiate it. Because relocating a group under a new parent causes that group's members to inherit the parent's permissions, a forged move can change effective authorization. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.7 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.
AnalysisAI
Cross-site request forgery in Concrete CMS before 9.5.3 allows an attacker to silently relocate user group tree nodes on behalf of an authenticated administrator, exploiting the missing action-token validation on the dashboard/users/groups/bulkupdate/confirm() endpoint. Because Concrete CMS inherits parent-group permissions down to child-group members, a forged group move can silently expand the authorization scope of affected users, granting access to restricted content areas without any administrator awareness. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be a Concrete CMS administrator (high-privileged backend user) with an active authenticated session at the time the forged request is delivered. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 5.7 appropriately reflects real-world mitigating factors: AT:P indicates the attack requires a specific precondition (an authenticated high-privileged administrator with an active session), and UI:P requires that administrator to passively visit attacker-controlled content. … 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 introduces action-token validation on the dashboard/users/groups/bulkupdate/confirm() endpoint, closing the CSRF surface. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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