EUVD-2026-31360

Concrete CMS 9.5.0 and below is vulnerable to IDOR in AddMessage/UpdateMessage via attachments parameter which can lead to file permission bypass. The AddMessage and UpdateMessage conversation controllers accept user-supplied file attachment IDs and load files directly via $em-findFile::class,...

EUVD-2026-31352

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The /ccm/frontend/conversations/messagedetail endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

EUVD-2026-31354

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/messagepage' endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

EUVD-2026-31358

Concrete CMS 9.5.0 and below is vulnerable to unauthenticated page metadata disclosure across every page with a configured summary template, revealing the existence of private, draft, and restricted pages while leaking title, path, description, and author information. The Concrete CMS security te...

EUVD-2026-31379

In Concrete CMS 9.5.0 and below, the RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation enabling redirect-to-internal bypasses. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.1 with a...

GHSA-2XP7-RPVC-PJWC Concrete CMS is vulnerable to IDOR

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/getrating' endpoint confirms existence and returns rating score for any message by ID...

GHSA-66RG-92Q4-6M8Q Concrete CMS is vulnerable to unauthorized file deletion

Concrete CMS 9.5.0 and below is vulnerable to unauthorized file deletion due to an Inverted CSRF token check in the DeleteFile controller. The code throws an error when the token IS valid and proceeds with file deletion when the token is invalid or missing. This effectively disables CSRF protecti...

GHSA-CHFM-CM6H-Q5X7 Concrete CMS is subject to Insecure Direct Object Reference (IDOR) in the Express Entry Detail block

Concrete CMS 9.5.0 and below is subject to Insecure Direct Object Reference IDOR in the Express Entry Detail block via the exEntryID parameter. This IDOR leads to unauthorized access to all Express form submissions. The Concrete CMS security team thanks Tristan Madani for reporting this issue...

EUVD-2026-31364

For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Code Handler Bypasses Account Status. A user with uIsActive=0 suspended, banned, terminated employee can still authenticate via OAuth and receive valid API tokens. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score o...

EUVD-2026-31349

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/getrating' 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...

EUVD-2026-31356

In Concrete CMS 9.5.0 and below, the submitpassword method in concrete/controllers/singlepage/downloadfile.php allows unauthorized file access since downloading permission-restricted files bypasses the viewfile permission check. Files without passwords can be downloaded and any user who knows a...

EUVD-2026-31347

Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication gate. The endpoint /ccm/system/dialogs/file/usage/fID accepts an integer file ID in the URL and returns internal site structure data page IDs, versions, URL paths to anyone who sends a GET request. The...

GHSA-GJWQ-9V8P-47W7 Concrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation

In Concrete CMS 9.5.0 and below, the RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation enabling redirect-to-internal bypasses...

GHSA-PCRH-GJ77-J4MW Concrete CMS is vulnerable to Stored XSS via external-link page cvName

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName because updateCollectionAliasExternal bypasses being sanitized...

GHSA-FQG3-8W8R-8G94 Concrete CMS has an unauthorized file access issue

In Concrete CMS 9.5.0 and below, the submitpassword method in concrete/controllers/singlepage/downloadfile.php allows unauthorized file access since downloading permission-restricted files bypasses the viewfile permission check. Files without passwords can be downloaded and any user who knows a...

Concrete CMS is vulnerable to IDOR

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The /ccm/frontend/conversations/messagedetail endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

Concrete CMS is vulnerable to IDOR in AddMessage/UpdateMessage

Concrete CMS 9.5.0 and below is vulnerable to IDOR in AddMessage/UpdateMessage via attachments parameter which can lead to file permission bypass. The AddMessage and UpdateMessage conversation controllers accept user-supplied file attachment IDs and load files directly via $em-findFile::class,...

GHSA-WMW3-3FV3-H54W Concrete CMS has a session-hardening bypass and allows password change without reauthorization

Concrete CMS 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass. The user-profile edit controller passes the entire raw POST array to UserInfo::update without field whitelisting resulting in password change without requiring the current password ...

GHSA-58C8-VVQW-CM7M Concrete CMS is vulnerable to IDOR combined with a missing authentication gate

Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication gate. The endpoint /ccm/system/dialogs/file/usage/fID accepts an integer file ID in the URL and returns internal site structure data page IDs, versions, URL paths to anyone who sends a GET request...

GHSA-F54H-78C9-C24H Concrete CMS: OAuth 2.0 Authorization-Code Handler Bypasses Account Status

For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Code Handler Bypasses Account Status. A user with uIsActive=0 suspended, banned, terminated employee can still authenticate via OAuth and receive valid API tokens...