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CVE-2026-68526— Concrete CMS before 9.5.3 is vulnerable to CSRF in the Calendar event duplicate 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 在 9.5.3 之前的版本中，其日历事件“复制”对话框控制器（concrete/controllers/dialog/event/duplicate.php）的 submit() 动作未对防 CSRF 令牌进行校验。该动作仅检查了 canAccess() 以及针对该资源的 canAddCalendarEvent() 权限，便允许复制日历事件。因此，经过精心构造的跨站请求（CSRF）能够促使拥有“添加事件”权限的已认证用户，以他们自己的身份创建重复的 CalendarEvent 和 Cale

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 9.5.2 affected
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I. Basic Information for CVE-2026-68526

Vulnerability Information
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Vulnerability Title
Concrete CMS before 9.5.3 is vulnerable to CSRF in the Calendar event duplicate dialog controller
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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 9.5.2 -

II. Public POCs for CVE-2026-68526

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III. Intelligence Information for CVE-2026-68526

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Vendor Pages for CVE-2026-68526 (1)

Same Patch Batch · Concrete CMS · 2026-09-11 · 10 CVEs total

CVE-2026-81908 6.0 MEDIUM Missing Authorization in Concrete CMS 9.2.0 to 9.5.2 REST API Groups List Endpoint Allows
CVE-2026-18122 6.0 MEDIUM Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entr
CVE-2026-68528 6.0 MEDIUM Concrete CMS 9.5.2 and below is vulnerable to Stored XSS in RSS Displayer Block via Unesca
CVE-2026-81909 5.9 MEDIUM Concrete CMS 9 through 9.5.2 is vulnerable to Missing Authorization in the orphaned-block
CVE-2026-81910 5.9 MEDIUM Concrete CMS 9 through 9.5.2 is vulnerable to Server-Side Template Injection (SSTI) in The
CVE-2026-81911 5.8 MEDIUM Concrete CMS versions 9.0.0 to 9.5.2 is vulnerable to Stored XSS in Board Custom Slot save
CVE-2026-81912 5.7 MEDIUM Concrete CMS before 9.5.3 is vulnerable to Cross-Site Request Forgery in the Move Multiple
CVE-2026-81913 5.3 MEDIUM Concrete CMS versions 9.5.0 through 9.5.2 are vulnerable to Open Redirect via the rcURL pa
CVE-2026-81915 5.1 MEDIUM In Concrete CMS below 9.5.3, Page Type update omits object-level authorization

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-68526

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