CVE-2023-1421

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.

CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-1562

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.

CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-1774

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.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-1775

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 clients.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-1776

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.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-1777

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-1831

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).

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-2193

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2281

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.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-2000

Unrestricted navigation due to unvalidated mattermost server redirection

Mattermost Desktop App fails to validate a mattermost server redirection and navigates to an arbitrary website

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Desktop

CVE-2023-2515

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

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Server

CVE-2023-2514

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. 

CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2808

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2783

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2784

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.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2786

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2787

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2788

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.

CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2791

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost

CVE-2023-2792

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost