Vendor
Concrete CMS
139 known vulnerabilities.
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High 8.7
Concrete CMS 9.0.0 through 9.5.2 is vulnerable to missing authorization in the user selector autocomplete endpoint (/ccm/system/user/autocomplete), allowing an unauthenticated attacker to retrieve the complete backend user directory — internal ID, username
Concrete CMS 9 (9.0.0 through 9.5.2) does not perform an authorization check on the user selector autocomplete endpoint (/ccm/system/user/autocomplete), which backs the "Preview as User" panel and other user-selector components. The endpoint validates only a …
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High 7.3CVE-2026-18116 Public exploit
Concrete CMS 8.3.0 to 9.5.2 is vulnerable to Stored XSS in Calendar Event Name via Workflow Approval Notifications
Concrete CMS 8.3.0 to 9.5.2 stored calendar event names without sanitization and rendered them without HTML escaping in the workflow approval and deletion notifications shown in the dashboard "Waiting For Me" block. A registered user permitted to add events t…
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Low 2.3CVE-2026-8347 Public exploit
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in Express association Reorder dialog
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in the Express association Reorder dialog. This can cause Cross-entity state tampering with view-only permission on one entry. To be affected, a website has to be using express an…
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Medium 6.3CVE-2026-8337 Public exploit
Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys when sites are running concurrent public surveys and private surveys
Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys. To be vulnerable, a site would have to be configured in such a way that both public and private surveys are present on the site. An unauthenticated attacker can vote in the restricted survey by su…
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Medium 6.3
Concrete CMS 9.5.0 and below is vulnerable to IDOR in the`/ccm/frontend/conversations/message_detail` endpoint
Concrete CMS 9.5.0 and below is vulnerable to IDOR. The `/ccm/frontend/conversations/message_detail` endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from re…
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Medium 6.3CVE-2026-8239 Public exploit
Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/get_rating'
Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/get_rating' endpoint confirms existence and returns rating score for any message by ID. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with …
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Medium 6.9
Concrete 9.5.0 and below has file usage disclosure via missing permission check in Usage controller
Concrete CMS 9.5.0 and below is vulnerable to unauthenticated file usage disclosure via missing permission check in the usage controller. Any unauthenticated visitor can request /ccm/system/dialogs/file/usage/{fID} with any file ID and receive a list of eve…
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Medium 4.8CVE-2025-8571 Public exploit
Concrete CMS 9 through 9.4.2 and below 8.5.21 is vulnerable to Reflected Cross-Site Scripting (XSS) in Conversation Messages Dashboard Page
Concrete CMS 9 to 9.4.2 and versions below 8.5.21 are vulnerable to Reflected Cross-Site Scripting (XSS) in the Conversation Messages Dashboard Page. Unsanitized input could cause theft of session cookies or tokens, defacement of web content, redirection to m…
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Low 2.0CVE-2025-8573 Public exploit
Concrete CMS 9 through 9.4.2 is vulnerable to Stored XSS from Home Folder on Members Dashboard page
Concrete CMS versions 9 through 9.4.2 are vulnerable to Stored XSS from Home Folder on Members Dashboard page. Version 8 was not affected. A rogue admin could set up a malicious folder containing XSS to which users could be directed upon login. The Concrete …
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Low 2.0CVE-2024-1247 Public exploit
Concrete CMS version 9 before 9.2.5 vulnerable to stored XSS via the Role Name field
Concrete CMS version 9 before 9.2.5 is vulnerable to stored XSS via the Role Name field since there is insufficient validation of administrator provided data for that field. A rogue administrator could inject malicious code into the Role Name field which mig…