Vendor
Mattermost
512 known vulnerabilities.
Products
330 results · Clear filters · Feed
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Medium 6.5
A team member can soft delete other teams that they are not part of
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
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Medium 4.9
System Role with manage posts permission can read posts of Direct Messages
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.
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Medium 6.5
DoS via Channel Notification Properties
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 tempor…
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Medium 4.3
Parameter tampering in the registration resulting in blocked accounts to be created
Mattermost fails to restrict which parameters' values it takes from the request during signup allowing an attacker to register users as inactive, thus blocking them from later accessing Mattermost without the system admin activating their accounts.
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Medium 4.5
Audit logging fails to sanitize post metadata
Mattermost fails to sanitize post metadata during audit logging resulting in permalinks contents being logged
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Medium 6.7
Incorrect authorization allows a user manager to update a system admin
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.
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Medium 6.3
A guest user can perform various 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.
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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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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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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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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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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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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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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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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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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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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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Medium 4.3
IDOR: Accessing playbook runs via the Playbooks Runs API
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.
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Medium 4.3
Authenticated user could send multiple requests containing a large Auto Responder Message payload and can crash a Mattermost server
A denial-of-service vulnerability in Mattermost allows an authenticated user to crash the server via multiple large autoresponder messages.
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Medium 4.3
Authenticated user could send multiple requests containing a large payload to a Playbooks API and can crash a Mattermost server
A denial-of-service vulnerability in the Mattermost Playbooks plugin allows an authenticated user to crash the server via multiple large requests to one of the Playbooks API endpoints.
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Medium 4.3
Guest accounts can list all public channels
The Guest account feature in Mattermost version 6.7.0 and earlier fails to properly restrict the permissions, which allows a guest user to fetch a list of all public channels in the team, in spite of not being part of those channels.
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Medium 4.3
Malicious imports can lead to Denial of Service
The legacy Slack import feature in Mattermost version 6.7.0 and earlier fails to properly limit the sizes of imported files, which allows an authenticated attacker to crash the server by importing large files via the Slack import REST API.
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Medium 6.5
Team members could access sensitive information of other users via an API call
Unrestricted information disclosure of all users in Mattermost version 6.7.0 and earlier allows team members to access some sensitive information by directly accessing the APIs.
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Medium 5.6
Incorrect defaults can cause attackers to bypass rate limitations
Incorrect default configuration for trusted IP header in Mattermost version 6.7.0 and earlier allows attacker to bypass some of the rate limitations in place or use manipulated IPs for audit logging via manipulating the request headers.
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Medium 4.3
A crafted SVG attachment can crash a Mattermost server
Uncontrolled resource consumption in Mattermost version 6.6.0 and earlier allows an authenticated attacker to crash the server via a crafted SVG attachment on a post.