Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation.. Mattermost Advisory ID: MMSA-2025-00565

Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to properly check for permissions when processing commands in the Gitlab plugin which allows normal users to uninstall instances or setup webhook connections via the {{gitlab instance {option}}} or the {{/gitlab webhook {option}}} commands. Mattermost Advisory ID: MMSA-2026-00600

Mattermost fails to delete the attachments when deleting a message in a thread allowing a simple user to still be able to access and download the attachment of a deleted message

Mattermost fails to check if the requesting user is a guest before performing different actions to public playbooks, resulting a guest being able to view, join, edit, export and archive public playbooks.

Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to the post rewrite endpoint.. Mattermost Advisory ID: MMSA-2026-00645

Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the OAuth state.

Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the RelayState

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate team membership when searching channels which allows a removed team member to enumerate all public channels within a private team via the channel search API endpoint.. Mattermost Advisory ID: MMSA-2025-00568

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the Confluence space which allows attackers to edit a subscription for a Confluence space the user does not have access for via edit subscription endpoint.

Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint

Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the Confluence space which allows attackers to create a subscription for a Confluence space the user does not have access to via the create subscription endpoint.

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create a channel subscription without proper access to the channel via API call to the edit channel subscription endpoint.

Mattermost fails to properly show information in the UI, allowing a system admin to modify a board state allowing any user with a valid sharing link to join the board with editor access, without the UI showing the updated permissions.

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to get channel subscription details without proper access to the channel via API call to the Get Channel Subscriptions details endpoint.

A missing permissions check in the /plugins/playbooks/api/v0/runs API in Mattermost allows an attacker to list and view playbooks belonging to a team they are not a member of.

Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.

Mattermost fails to check if an admin user account active after an oauth2 flow is started, allowing an attacker with admin privileges to retain persistent access to Mattermost by obtaining an oauth2 access token while the attacker's account is deactivated.

Mattermost fails to verify if the requestor is a sysadmin or not, before allowing `install` requests to the Apps allowing a regular user send install requests to the Apps.

Mattermost fails to invalidate existing authorization codes when deauthorizing an OAuth2 app, allowing an attacker possessing an authorization code to generate an access token.

When processing an email invite to a private channel on a team, Mattermost fails to validate the inviter's permission to that channel, allowing an attacker to invite themselves to a private channel.

Mattermost version 6.4.x and earlier fails to properly check the plugin version when a plugin is installed from the Marketplace, which allows an authenticated and an authorized user to install and exploit an old plugin version from the Marketplace which might have known vulnerabilities.

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

A missing permissions check in Mattermost Playbooks in Mattermost allows an attacker to modify a playbook via the /plugins/playbooks/api/v0/playbooks/[playbookID] API.

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to get channel subscription details without proper access to the channel via API call to the GET autocomplete/GetChannelSubscriptions endpoint.

Mattermost Confluence Plugin version <1.5.0 fails to enforce authentication of the user to the Mattermost instance which allows unauthenticated attackers to access subscription details without via API call to GET subscription endpoint.

The affiliate-toolkit – WordPress Affiliate Plugin plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on the atkp_import_product() function in all versions up to, and including, 3.5.4. This makes it possible for authenticated attackers, with subscriber-level access and above, to to perform unauthorized actions such as creating importing products.

The Advanced Classifieds & Directory Pro plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the ajax_callback_delete_attachment function in all versions up to, and including, 3.0.0. This makes it possible for authenticated attackers, with subscriber access or higher, to delete arbitrary media uploads.

The GPT AI Power: Content Writer & ChatGPT & Image Generator & WooCommerce Product Writer & AI Training WordPress plugin before 1.4.38 does not perform any kind of nonce or privilege checks before letting logged-in users modify arbitrary posts.

The Mediamatic – Media Library Folders plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on its AJAX actions in versions up to, and including, 2.8.1. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to change image categories, which it uses to arrange them in folder views.

The Logo Showcase with Slick Slider WordPress plugin before 1.2.5 does not have CSRF and authorisation checks in the lswss_save_attachment_data AJAX action, allowing any authenticated users, such as Subscriber, to change title, description, alt text, and URL of arbitrary uploaded media.

The Countdown Block WordPress plugin before 1.1.2 does not have authorisation in the eb_write_block_css AJAX action, which allows any authenticated user, such as Subscriber, to modify post contents displayed to users.

A missing permission check in Jenkins Openstack Heat Plugin 1.5 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL.

The Social Icons Widget & Block by WPZOOM plugin for WordPress is vulnerable to unauthorized data modification due to a missing capability check in the add_menu_item() method hooked to admin_menu in all versions up to, and including, 4.5.8. This is due to the method performing wp_insert_post() and update_post_meta() calls to create a sharing configuration without verifying the current user has administrator-level capabilities. This makes it possible for authenticated attackers, with Subscriber-level access and above, to trigger the creation of a published wpzoom-sharing configuration post with default sharing button settings, which causes social sharing buttons to be automatically injected into all post content on the frontend via the the_content filter.

The Admin Bar Remover plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the update_form() function in all versions up to, and including, 1.0.2.2. This makes it possible for authenticated attackers, with subscriber-level access and above, to enable or disable the admin bar on the front-end of the site.

The Categorify plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the categorifyAjaxDeleteCategory function in all versions up to, and including, 1.0.7.4. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete categories.

The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the tutor_delete_announcement() function in all versions up to, and including, 2.6.1. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary posts.

The Categorify plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the categorifyAjaxRenameCategory function in all versions up to, and including, 1.0.7.4. This makes it possible for authenticated attackers, with subscriber-level access and above, to rename categories.

The RevivePress – Keep your Old Content Evergreen plugin for WordPress is vulnerable to unauthorized access and modification of data due to a missing capability check on the import_data and copy_data functions in all versions up to, and including, 1.5.6. This makes it possible for authenticated attackers, with subscriber-level access or higher, to overwrite plugin settings and view them.

The Categorify plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the categorifyAjaxUpdateFolderPosition in all versions up to, and including, 1.0.7.4. This makes it possible for authenticated attackers, with subscriber-level access and above, to update the folder position of categories as well as update the metadata of other taxonomies.

The Colibri Page Builder plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the callActivateLicenseEndpoint function in all versions up to, and including, 1.0.260. This makes it possible for authenticated attackers, with subscriber access or higher, to update the license key.

The Total theme for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the total_order_sections() function in all versions up to, and including, 2.1.59. This makes it possible for authenticated attackers, with subscriber-level access and above, to repeat sections on the homepage.

The Image Watermark plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the watermark_action_ajax() function in all versions up to, and including, 1.7.3. This makes it possible for authenticated attackers, with subscriber-level access and above, to apply and remove watermarks from images.

In JetBrains TeamCity before 2025.11.3 missing authorization allowed project developers to add parameters to build configurations

Missing Authorization vulnerability in Appointment Booking Calendar plugin <= 1.3.69 on WordPress.

The Tutor LMS – Migration Tool plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the tutor_import_from_xml function in all versions up to, and including, 2.2.0. This makes it possible for authenticated attackers, with subscriber-level access and above, to import courses.

The WooCommerce Tools plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the woocommerce_tool_toggle_module() function in all versions up to, and including, 1.2.9. This makes it possible for authenticated attackers, with subscriber-level access and above, to deactivate arbitrary plugin modules.

The Paid Membership Subscriptions – Effortless Memberships, Recurring Payments & Content Restriction plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the creating_pricing_table_page function in all versions up to, and including, 2.11.1. This makes it possible for authenticated attackers, with subscriber access or higher, to create pricing tables.