Mattermost Server vulnerabilities

CVE-2023-3581 [HIGH] CWE-346 CVE-2023-3581: Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.

CVE-2023-3591 [HIGH] CWE-287 CVE-2023-3591: Mattermost fails to invalidate previously generated password reset tokens when a new reset token was Mattermost fails to invalidate previously generated password reset tokens when a new reset token was created.

CVE-2023-3590 [HIGH] CWE-863 CVE-2023-3590: Mattermost fails to delete card attachments in Boards, allowing an attacker to access deleted attach Mattermost fails to delete card attachments in Boards, allowing an attacker to access deleted attachments.

CVE-2023-3582 [MEDIUM] CWE-863 CVE-2023-3582: Mattermost fails to verify channel membership when linking a board to a channel allowing a low-privi Mattermost fails to verify channel membership when linking a board to a channel allowing a low-privileged authenticated user to link a Board to a private channel they don't have access to,

CVE-2023-3577 [MEDIUM] CWE-918 CVE-2023-3577: Mattermost fails to properly restrict requests to localhost/intranet during the interactive dialog, Mattermost fails to properly restrict requests to localhost/intranet during the interactive dialog, which could allow an attacker to perform a limited blind SSRF.

CVE-2023-3593 [MEDIUM] CWE-400 CVE-2023-3593: Mattermost fails to properly validate markdown, allowing an attacker to crash the server via a speci Mattermost fails to properly validate markdown, allowing an attacker to crash the server via a specially crafted markdown input.

CVE-2023-3586 [MEDIUM] CWE-863 CVE-2023-3586: Mattermost fails to disable public Boards after the "Enable Publicly-Shared Boards" configuration op Mattermost fails to disable public Boards after the "Enable Publicly-Shared Boards" configuration option is disabled, resulting in previously-shared public Boards to remain accessible.

CVE-2023-3585 [MEDIUM] CWE-400 CVE-2023-3585: Mattermost Boards fail to properly validate a board link, allowing an attacker to crash a channel by Mattermost Boards fail to properly validate a board link, allowing an attacker to crash a channel by posting a specially crafted boards link.

CVE-2023-3584 [LOW] CWE-863 CVE-2023-3584: Mattermost fails to properly check the authorization of POST /api/v4/teams when passing a team overr Mattermost fails to properly check the authorization of POST /api/v4/teams when passing a team override scheme ID in the request, allowing an authenticated attacker with knowledge of a Team Override Scheme ID to create a new team with said team override scheme.

CVE-2023-3587 [LOW] CWE-862 CVE-2023-3587: Mattermost fails to properly show information in the UI, allowing a system admin to modify a board s 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.

CVE-2023-3613 [LOW] CWE-863 CVE-2023-3613: Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding user Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding users to channels allowing guest accounts to be added or invited to channels by default.

CVE-2023-3614 [LOW] CWE-400 CVE-2023-3614: Mattermost fails to properly validate a gif image file, allowing an attacker to consume a significan Mattermost fails to properly validate a gif image file, allowing an attacker to consume a significant amount of server resources, making the server unresponsive for an extended period of time by linking to specially crafted image file.

CVE-2023-2515 [HIGH] CWE-863 CVE-2023-2515: Mattermost fails to restrict a user with permissions to edit other users and to create personal acce 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-2023-2281 [MEDIUM] CWE-200 CVE-2023-2281: When archiving a team, Mattermost fails to sanitize the related Websocket event sent to currently co When archiving a team, Mattermost fails to sanitize the related Websocket event sent to currently connected clients. This allows the clients to see the name, display name, description, and other data about the archived team.

CVE-2023-1831 [HIGH] CWE-200 CVE-2023-1831: Mattermost fails to redact from audit logs the user password during user creation and the user passw Mattermost fails to redact from audit logs the user password during user creation and the user password hash in other operations if the experimental audit logging configuration was enabled (ExperimentalAuditSettings section in config).

CVE-2023-1777 [MEDIUM] CWE-200 CVE-2023-1777: Mattermost allows an attacker to request a preview of an existing message when creating a new messag 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-2023-1776 [MEDIUM] CWE-79 CVE-2023-1776: Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a c Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.

CVE-2023-1774 [MEDIUM] CWE-862 CVE-2023-1774: When processing an email invite to a private channel on a team, Mattermost fails to validate the inv 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.

CVE-2023-1775 [MEDIUM] CWE-200 CVE-2023-1775: When running in a High Availability configuration, Mattermost fails to sanitize some of the user_upd 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.

CVE-2023-1421 [MEDIUM] CWE-79 CVE-2023-1421: A reflected cross-site scripting vulnerability in the OAuth flow completion endpoints in Mattermost A reflected cross-site scripting vulnerability in the OAuth flow completion endpoints in Mattermost allows an attacker to send AJAX requests on behalf of the victim via sharing a crafted link with a malicious state parameter.