Board data modification via missing CSRF validation
Published Sep 10, 2026 · Updated Sep 10, 2026
Cross-site request forgery in Concrete CMS 9.0.0 through 9.5.2 allows attackers to modify board custom-slot data remotely. The Boards custom slot dialog's saveTemplate() action accepts slot and template values without validating an anti-CSRF token, then creates a board_slot_proxy Block and dispatches AddCustomSlotToBoardCommand before rendering. The victim must have an active session with board-edit permission and load an attacker-controlled request; the resulting write runs under that user's authority.
Summary
What happened
Cross-site request forgery in Concrete CMS 9.0.0 through 9.5.2 allows attackers to modify board custom-slot data remotely. The Boards custom slot dialog's saveTemplate() action accepts slot and template values without validating an anti-CSRF token, then creates a board_slot_proxy Block and dispatches AddCustomSlotToBoardCommand before rendering. The victim must have an active session with board-edit permission and load an attacker-controlled request; the resulting write runs under that user's authority.
The record
- CVE
- CVE-2026-84432
- Published
- Sep 10, 2026
- Updated
- Sep 10, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- T1204
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 10, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=9.0.0 <=9.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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