Github.Com Mattermost Mattermost-Server V6 vulnerabilities

CVE-2023-43754 [MEDIUM] CWE-200 Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost fails to check whether the "Allow users to view archived channels" setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the "Allow users to view archived channels" setting is disabled.

CVE-2023-48268 [MEDIUM] CWE-400 Mattermost Uncontrolled Resource Consumption vulnerability Mattermost Uncontrolled Resource Consumption vulnerability Mattermost fails to limit the amount of data extracted from compressed archives during board import in Mattermost Boards allowing an attacker to consume excessive resources, possibly leading to Denial of Service, by importing a board using a specially crafted zip (zip bomb).

CVE-2023-35075 [LOW] CWE-74 Mattermost Injection vulnerability Mattermost Injection vulnerability Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though.

CVE-2023-5967 [MEDIUM] CWE-754 Mattermost denial of service vulnerability Mattermost denial of service vulnerability Mattermost fails to properly validate requests to the Calls plugin, allowing an attacker sending a request without a User Agent header to cause a panic and crash the Calls plugin

CVE-2023-5968 [MEDIUM] CWE-116 Mattermost password hash disclosure vulnerability Mattermost password hash disclosure vulnerability Mattermost fails to properly sanitize the user object when updating the username, resulting in the password hash being included in the response body.

CVE-2023-5969 [MEDIUM] CWE-400 Mattermost vulnerable to excessive memory consumption Mattermost vulnerable to excessive memory consumption Mattermost fails to properly sanitize the request to `/api/v4/redirect_location` allowing an attacker, sending a specially crafted request to `/api/v4/redirect_location`, to fill up the memory due to caching large items.

CVE-2023-5195 [MEDIUM] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability Mattermost fails to properly validate the permissions when soft deleting a team allowing a team member to soft delete other teams that they are not part of

CVE-2023-5194 [MEDIUM] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability Mattermost fails to properly validate permissions when demoting and deactivating a user allowing for a system/user manager to demote / deactivate another manager

CVE-2023-5196 [MEDIUM] CWE-400 Mattermost Uncontrolled Resource Consumption vulnerability Mattermost Uncontrolled Resource Consumption vulnerability Mattermost fails to enforce character limits in all possible notification props allowing an attacker to send a really long value for a notification_prop resulting in the server consuming an abnormal quantity of computing resources and possibly becoming temporarily unavailable for its users.

CVE-2023-5193 [LOW] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability Mattermost fails to properly check permissions when retrieving a post allowing for a System Role with the permission to manage channels to read the posts of a DM conversation.

CVE-2023-5159 [LOW] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability Mattermost fails to properly verify the permissions when managing/updating a bot allowing a User Manager role with user edit permissions to manage/update bots.

CVE-2023-4108 [MEDIUM] CWE-200 Mattermost fails to sanitize post metadata Mattermost fails to sanitize post metadata Mattermost fails to sanitize post metadata during audit logging, resulting in permalinks' contents being logged.

CVE-2023-4106 [MEDIUM] CWE-284 Mattermost fails to check if user is a guest before performing actions on public playbooks Mattermost fails to check if user is a guest before performing actions on public playbooks 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.

CVE-2023-4107 [MEDIUM] CWE-284 Mattermost does not validate requesting user permissions before updating admin details Mattermost does not validate requesting user permissions before updating admin details Mattermost fails to properly validate the requesting user permissions when updating a system admin, allowing a user manager to update a system admin's details such as email, first name and last name.

CVE-2023-4105 [LOW] CWE-284 Mattermost fails to correctly delete attachments Mattermost fails to correctly delete attachments 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

CVE-2023-2783 [MEDIUM] CWE-862 Mattermost Server Missing Authorization vulnerability Mattermost Server Missing Authorization vulnerability Mattermost Apps Framework fails to verify that a secret provided in the incoming webhook request allowing an attacker to modify the contents of the post sent by the Apps.

CVE-2023-2515 [HIGH] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability Mattermost fails to restrict a user with permissions to edit other users and to create personal access tokens from elevating their privileges to system admin

CVE-2023-1775 [MEDIUM] CWE-668 Mattermost vulnerable to information disclosure Mattermost vulnerable to information disclosure When running in a High Availability configuration, Mattermost fails to sanitize some of the `user_updated` and` post_deleted` events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients. [Issue Identifier](https://mattermost.com/security-updates/): MMSA-2023-00138

CVE-2023-1777 [MEDIUM] CWE-668 Mattermost vulnerable to information disclosure Mattermost vulnerable to information disclosure Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.

CVE-2023-1774 [MEDIUM] CWE-862 Mattermost fails to properly authentication inviter's permissions to private channel Mattermost fails to properly authentication inviter's permissions to private channel 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. [Issue Identifier](https://mattermost.com/security-updates/): MMSA-2023-00137