CVE-2026-87031 Missing authorization in the REST API user creation endpoint in Concrete CMS 9.2.0 through 9.5.3 allows arbitrary account creation

n Concrete CMS 9.2.0 through 9.5.3, the REST API user creation endpoint POST /ccm/api/1.0/users, the add method of concrete/src/Api/Controller/Users.php did not perform a permission check before creating an account. As a result, any valid OAuth token carrying the users:add scope, including a...

CVE-2026-87031

Concrete CMS versions 9.2.0 through 9.5.3 contain a missing authorization check in the REST API user creation endpoint (POST /ccm/api/1.0/users, the add() method of concrete/src/Api/Controller/Users.php). Because no permission check was performed before account creation, any valid OAuth token car...

CVE-2026-87028 Cross-Board IDOR in the Board Custom Slot Preview in Concrete CMS 9.0.0 through 9.5.3 Discloses Restricted Page Summary Fields

Concrete CMS 9 through 9.5.3 did not confirm that a board InstanceItem submitted to the custom-slot preview endpoint belonged to the board instance the requesting user was authorized to edit, and did not enforce page-view permission before generating page-backed summary content. As a result, an...

CVE-2026-87028

CVE-2026-87028 is a cross-board Insecure Direct Object Reference (IDOR) in the Board Custom Slot Preview endpoint of Concrete CMS 9.0.0 through 9.5.3 . The endpoint failed to verify that a submitted InstanceItem belonged to the board instance the requesting user was authorized to edit, and did no...

EUVD-2026-80881

Concrete CMS 9 through 9.5.3 did not confirm that a board InstanceItem submitted to the custom-slot preview endpoint belonged to the board instance the requesting user was authorized to edit, and did not enforce page-view permission before generating page-backed summary content. As a result, an...

CVE-2026-87028 Cross-Board IDOR in the Board Custom Slot Preview in Concrete CMS 9.0.0 through 9.5.3 Discloses Restricted Page Summary Fields

Concrete CMS 9 through 9.5.3 did not confirm that a board InstanceItem submitted to the custom-slot preview endpoint belonged to the board instance the requesting user was authorized to edit, and did not enforce page-view permission before generating page-backed summary content. As a result, an...

CVE-2026-87028 Cross-Board IDOR in the Board Custom Slot Preview in Concrete CMS 9.0.0 through 9.5.3 Discloses Restricted Page Summary Fields

Concrete CMS 9 through 9.5.3 did not confirm that a board InstanceItem submitted to the custom-slot preview endpoint belonged to the board instance the requesting user was authorized to edit, and did not enforce page-view permission before generating page-backed summary content. As a result, an...

EUVD-2026-80879

Concrete CMS before 9.5.4 did not sanitize XML and XSLT documents uploaded through a public Form Block file-upload question. Plain XML uploads were validated by file extension only and stored as publicly accessible files that were served inline from the application's own origin. An unauthenticate...

CVE-2026-85386 Concrete CMS before 9.5.4 stored is vulneratble to cross-site scripting via unauthenticated XML/XSLT file upload in the Form Block

Concrete CMS before 9.5.4 did not sanitize XML and XSLT documents uploaded through a public Form Block file-upload question. Plain XML uploads were validated by file extension only and stored as publicly accessible files that were served inline from the application's own origin. An unauthenticate...

CVE-2026-85386

Concrete CMS before 9.5.4 is vulnerable to stored cross-site scripting via unauthenticated file upload in the Form Block component. XML and XSLT documents submitted through a public file-upload question were validated by file extension only and served inline from the application's own origin. An ...

CVE-2026-85386 Concrete CMS before 9.5.4 stored is vulneratble to cross-site scripting via unauthenticated XML/XSLT file upload in the Form Block

Concrete CMS before 9.5.4 did not sanitize XML and XSLT documents uploaded through a public Form Block file-upload question. Plain XML uploads were validated by file extension only and stored as publicly accessible files that were served inline from the application's own origin. An unauthenticate...

CVE-2026-85385 Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field

Concrete CMS below 9.5.4 did not validate the user timezone value uTimezone on write and rendered it without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName returns any non-IANA value unchanged. A stored cross-site scripting payload saved in this field...

CVE-2026-85385 Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field

Concrete CMS below 9.5.4 did not validate the user timezone value uTimezone on write and rendered it without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName returns any non-IANA value unchanged. A stored cross-site scripting payload saved in this field...

EUVD-2026-80877

Concrete CMS below 9.5.4 did not validate the user timezone value uTimezone on write and rendered it without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName returns any non-IANA value unchanged. A stored cross-site scripting payload saved in this field...

CVE-2026-85385 Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field

Concrete CMS below 9.5.4 did not validate the user timezone value uTimezone on write and rendered it without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName returns any non-IANA value unchanged. A stored cross-site scripting payload saved in this field...

CVE-2026-85385

Concrete CMS versions below 9.5.4 contain a stored cross-site scripting (XSS) vulnerability in the uTimezone field. The value is not validated on write and is rendered without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName() passes any non-IANA value thr...

SUSE-SU-2026:23788-1 Security update for openssl-3-livepatches

This update for openssl-3-livepatches fixes the following issues: - "HollowByte" DoS via attacker-controlled memory allocation bsc1271712. - CVE-2026-14457: RPK Server Signature Algorithm Selection Can Dereference a Missing Certificate bsc1274792. - CVE-2026-63072: Heap Buffer Overflow in CMS Key...

SUSE-SU-2026:23794-1 Security update for openssl-3-livepatches

This update for openssl-3-livepatches fixes the following issues: - "HollowByte" DoS via attacker-controlled memory allocation bsc1271712. - CVE-2026-14457: RPK Server Signature Algorithm Selection Can Dereference a Missing Certificate bsc1274792. - CVE-2026-63072: Heap Buffer Overflow in CMS Key...

CVE-2026-92247

A security vulnerability has been detected in synaptikcms synaptik-cms up to 1.3.4.4. This affects the function rename of the file admin/file-manager.php of the component Admin File Manager. The manipulation leads to unrestricted upload. The attack can be initiated remotely. The exploit has been...

EUVD-2026-80091

A security vulnerability has been detected in synaptikcms synaptik-cms up to 1.3.4.4. This affects the function rename of the file admin/file-manager.php of the component Admin File Manager. The manipulation leads to unrestricted upload. The attack can be initiated remotely. The exploit has been...