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CVE-2026-84432— Concrete CMS 9 through 9.5.2 is vulnerable to CSRFin the Boards custom slot dialog controller

Quick assessment

Affected
Concrete CMS Concrete CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Concrete CMS 9 至 9.5.2 版本在 Boards 自定义槽位对话框控制器（ ）的 操作中未验证防 CSRF（跨站请求伪造）令牌。该操作会创建一个 Block，并针对目标 board 实例分发一个 命令，但其权限校验仅基于资源级别的 权限。因此，一个精心构造的跨站请求可导致拥有 board 编辑权限且会话有效的用户，在自身权限范围内，将攻击者指定的槽位和模板数据写入 board。由于该状态变更的数据库写入在任何下游渲染之前已经完成，因此即使 HTTP 响应返回非 200 状态码，伪造的请求仍然成功执

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 9.0.0≤ 9.5.2 affected
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I. Basic Information for CVE-2026-84432

Vulnerability Information
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Vulnerability Title
Concrete CMS 9 through 9.5.2 is vulnerable to CSRFin the Boards custom slot dialog controller
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Concrete CMS Concrete CMS 9.0.0 ~ 9.5.2 -

II. Public POCs for CVE-2026-84432

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III. Intelligence Information for CVE-2026-84432

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Vendor Pages for CVE-2026-84432 (1)

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-352

V. Comments for CVE-2026-84432

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