CVE-2026-85386: Improper Neutralization of Input During Web Page Generation

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-2026-87031: Missing Authorization

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-2026-85385: Improper Neutralization of Input During Web Page Generation

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-2026-92591: Not Failing Securely

Craft CMS 5.0.0 through 5.10.12 treats a database connection failure as meaning that Craft is not installed, which makes anonymous installer actions — including install/validate-site — reachable on an installed production site whenever PHP remains available but the configured MySQL endpoint does...

CVE-2026-85387: Insufficient Session Expiration

Concrete CMS before 9.5.4 re-authorized OAuth REST API requests from the bearer token alone and did not re-check the state of the account the token had been issued to. The resource server's authorization validator confirmed only that a token existed, had not expired, and had not been explicitly...

CVE-2026-92594: Exposure of Sensitive Information to an Unauthorized Actor

Craft CMS 5.0.0-RC1 through versions before 5.11.0 incorrectly authorize the GraphQL draftCreator and revisionCreator fields: instead of requiring the user-data scope enforced by Gql::canQueryUsers usergroups.:read, these fields are gated only on the elements.drafts:read / elements.revisions:read...

CVE-2026-92247: Unrestricted Upload of File with Dangerous Type

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...

CVE-2026-18120: Missing Authorization

Concrete CMS before 9.5.3 exposed a legacy Express entry search endpoint that returned entry result JSON without invoking the canViewExpressEntries permission check applied by the normal dashboard and CSV Export flow. An unauthenticated visitor who knew or discovered an Express entity identifier...

CVE-2026-92592: Improper Neutralization of Special Elements Used in a Template Engine

Craft CMS 4.8.0 through 4.18.5 and 5.0.0 through 5.10.12 sign an authenticated user's attacker-controlled license-shun cookie with the same key and format used to validate signed redirect parameters, because the HMAC signature is not bound to its purpose Yii's cookieValidationKey is derived from...

CVE-2026-81927

Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode concrete.filemanager.images.svgsanitization.action = reject, uploaded SVGs were checked...

CVE-2026-81926

Concrete CMS 9.4.0 through 9.5.2 did not escape colliding page paths before rendering them in the location panel's duplicate-path confirmation dialog. The panel's check endpoint returned the submitted path unmodified in its JSON response, and client-side JavaScript inserted each value into the...

CVE-2026-18426

Concrete CMS 9.0.0 through 9.5.2 did not enforce a block-level edit-permission check on the Express Form block's control-management actions, which relied solely on CSRF token validation. Because the token is bound to the user and action rather than to a specific block, page, or form, an...

EUVD-2026-79945

Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode concrete.filemanager.images.svgsanitization.action = reject, uploaded SVGs were checked...

CVE-2026-81927 Concrete CMS before 9.5.3 is vulnerable to Stored XSS via SVG upload in "Reject" sanitization mode

Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode concrete.filemanager.images.svgsanitization.action = reject, uploaded SVGs were checked...

CVE-2026-81927 Concrete CMS before 9.5.3 is vulnerable to Stored XSS via SVG upload in "Reject" sanitization mode

Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode concrete.filemanager.images.svgsanitization.action = reject, uploaded SVGs were checked...

CVE-2026-81927 Concrete CMS before 9.5.3 is vulnerable to Stored XSS via SVG upload in "Reject" sanitization mode

Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode concrete.filemanager.images.svgsanitization.action = reject, uploaded SVGs were checked...

CVE-2026-81927

Concrete CMS before 9.5.3 contained a stored XSS vulnerability in its SVG file handling. The flaw is triggered only when SVG sanitization is set to the non-default "reject" mode (concrete.file_manager.images.svg_sanitization.action = reject). In that mode, uploaded SVGs were checked against a sma...

CVE-2026-81925

Concrete CMS before 9.5.3 improperly neutralized a user-supplied custom date format when rendering conversation messages, resulting in reflected cross-site scripting. An attacker could execute arbitrary JavaScript in the browser of a user who was tricked into submitting a crafted POST request to...

CVE-2026-18425

Concrete CMS 9 before 9.5.3 authorized the dashboard sitemap reorder action Concrete\Controller\Backend\Dashboard\SitemapUpdate using only the global accesssitemap task permission and did not check per-page edit permission before updating each page's display order. As a result, an authenticated...

CVE-2026-18424

Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Server-Side Request Forgery iremote file import via cross-port reuse of a host's validated DNS pin. When multiple remote URLs share the same host, only the first ValidatedRemoteUrl is retained and reused for every later URL with that host. A...