Vendor
Mattermost
512 known vulnerabilities.
Products
512 results · Feed
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Low 3.1
Attachment of deleted message in a thread remains accessible and downloadable
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
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Medium 4.3
Server crash via a specially crafted markdown input
Mattermost fails to properly validate markdown, allowing an attacker to crash the server via a specially crafted markdown input.
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High 8.1
Lack of server certificate validation in websockets connection
Mattermost iOS app fails to properly validate the server certificate while initializing the TLS connection allowing a network attacker to intercept the WebSockets connection.
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Medium 4.3
Denial of Service via specially crafted gif image
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.
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Low 3.5
Guest accounts invited and added to channels by Welcomebot plugin
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.
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Medium 4.8
Lack of previous password reset tokens on new token creation
Mattermost fails to invalidate previously generated password reset tokens when a new reset token was created.
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Low 3.1
Deleted attachments in Boards remain accessible
Mattermost fails to delete card attachments in Boards, allowing an attacker to access deleted attachments.
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Low 2.7
Inconsistent state in UI after boards permission change by system admin
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.
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Medium 4.2
Disabling publicly-shared boards does not disable existing publicly available board links
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.
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Medium 4.3
channel DoS by sharing a boards link
Mattermost Boards fail to properly validate a board link, allowing an attacker to crash a channel by posting a specially crafted boards link.
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Low 3.1
Member can create team with team override scheme
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 schem…
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Medium 4.3
Lack of channel membership check when linking a board to a channel
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,
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Medium 6.2
WebSockets accept connections from HTTPS origin
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.
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Low 3.5
Limited blind SSRF to localhost/intranet in interactive dialog implementation
Mattermost fails to properly restrict requests to localhost/intranet during the interactive dialog, which could allow an attacker to perform a limited blind SSRF.
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Medium 4.3
Specially crafted search query can cause large log entries in postgres
Mattermost fails to properly truncate the postgres error log message of a search query failure allowing an attacker to cause the creation of large log files which can result in Denial of Service
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Medium 4.3
Denial of Service while unescaping a Markdown string
Mattermost fails to unescape Markdown strings in a memory-efficient way, allowing an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.
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Low 3.1
Path traversal in GitHub plugin's code preview feature
Mattermost fails to sanitize code permalinks, allowing an attacker to preview code from private repositories by posting a specially crafted permalink on a channel.
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Medium 6.5
Stack exhaustion in PreparePostForClientWithEmbedsAndImages
Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.
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Medium 6.5
Ephemeral messages return private channel contents in permalink previews
Mattermost fails to sanitize ephemeral error messages, allowing an attacker to obtain arbitrary message contents by a specially crafted /groupmsg command.
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Medium 4.3
Playbooks lets you edit arbitrary posts
When creating a playbook run via the /dialog API, Mattermost fails to validate all parameters, allowing an authenticated attacker to edit an arbitrary channel post.
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Medium 6.2
Deactivated user can retain access using oauth2 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.
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Medium 6.5
Collapsed Reply Threads APIs leak message contents from private channels
Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.
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Medium 4.3
Channel commands execution doesn't properly verify permissions
Mattermost fails to properly check the permissions when executing commands allowing a member with no permissions to post a message in a channel to actually post it by executing channel commands.
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Medium 4.2
Apps Framework allows install requests from regular members via an internal path
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.
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Medium 4.3
App Framework does not checks for the secret provided in the incoming webhook request
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.
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Medium 4.3
Lack of URL normalization allows rendering previews for disallowed domains
Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.
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Medium 6.7
DB username/password revealed in application logs
Mattermost Sever fails to redact the DB username and password before emitting an application log during server initialization.
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Medium 4.7
Privilege escalation to system admin via personal access tokens
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
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Medium 5.4
Unrestricted navigation due to unvalidated mattermost server redirection
Mattermost Desktop App fails to validate a mattermost server redirection and navigates to an arbitrary website
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Low 3.1
Archiving a team broadcasts unsanitized data over WebSockets
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.
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Medium 6.5
Oauth authorization codes do not expire when deauthorizing an oauth2 app
Mattermost fails to invalidate existing authorization codes when deauthorizing an OAuth2 app, allowing an attacker possessing an authorization code to generate an access token.
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High 7.2
User password logged in audit logs
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).
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Medium 6.5
Information disclosure in linked message previews
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.
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High 7.3
Stored XSS via SVG attachment on Boards
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.
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Medium 4.3
Unsanitized events sent over Websocket to regular users in a High Availability environment
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 cli…
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Medium 4.2
Unauthorized email invite to a 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.
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Low 3.5
Full name revealed via /plugins/focalboard/api/v2/users
Mattermost fails to check the "Show Full Name" setting when rendering the result for the /plugins/focalboard/api/v2/users API call, allowing an attacker to learn the full name of a board owner.
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Low 3.5
Reflected XSS in OAuth flow completion endpoints
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.
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Low 2.7
Disclosure of team owner email address when when accessing the teams API
Mattermost fails to honor the ShowEmailAddress setting when constructing a response to the /api/v4/users/me/teams API endpoint, allowing an attacker with team admin privileges to learn the team owner's email address in the response.
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Low 2.7
Disclosure of team owner email address when regenerating Invite ID
Mattermost fails to honor the ShowEmailAddress setting when constructing a response to the "Regenerate Invite Id" API endpoint, allowing an attacker with team admin privileges to learn the team owner's email address in the response.