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Medium 4.3
Log Flooding due to specially crafted requests in different endpoints
Mattermost fails to limit the log size of server logs allowing an attacker sending specially crafted requests to different endpoints to potentially overflow the log.
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Medium 4.3
Denial of Service via specially crafted block fields in Mattermost Boards
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted…
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Medium 4.3
Denial of Service via Board Import Zip Bomb
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…
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Medium 4.3
Users full name disclosure through Mattermost Boards with Show Full Name Option disabled
Mattermost fails to properly validate the "Show Full Name" option in a few endpoints in Mattermost Boards, allowing a member to get the full name of another user even if the Show Full Name option was disabled.
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Medium 4.3
Username and Icon override can be used by members when Hardened Mode is enabled
Mattermost fails to check if hardened mode is enabled when overriding the username and/or the icon when posting a post. If settings allowed integrations to override the username and profile picture when posting, a member could also override the username and i…
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Medium 5.3
Denial of Service via Link Preview in /api/v4/redirect_location
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.
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Medium 4.9CVE-2023-5968 Public exploit
Password hash in response body after username update
Mattermost fails to properly sanitize the user object when updating the username, resulting in the password hash being included in the response body.
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Medium 4.3
Denial of Service via crashing the Calls Plugin
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
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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 4.5
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
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 4.7
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 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 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 4.7
Authorized users are allowed to install old plugin versions from the Marketplace
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…
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Medium 4.3
Restricted custom admin role can bypass the restrictions and view the server logs and server config.json file contents
One of the API in Mattermost version 6.4.1 and earlier fails to properly protect the permissions, which allows the authenticated members with restricted custom admin role to bypass the restrictions and view the server logs and server config.json file contents.
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Medium 4.3
OOM DoS in Mattermost image proxy
The image proxy component in Mattermost version 6.4.1 and earlier allocates memory for multiple copies of a proxied image, which allows an authenticated attacker to crash the server via links to very large image files.