Vulnerabilidades de Mattermost

CVE-2025-14822 Média · 6.5 CWE-770 16/01/2026

DoS from quadratic complexity in model.ParseHashtags

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

CVE-2025-64641 Média · 4.1 CWE-863 24/12/2025

Mattermost Jira plugin crafted action leaks Jira issue details

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

CVE-2025-13767 Média · 4.3 CWE-863 24/12/2025

Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.

CVE-2025-14273 Alta · 8.3 CWE-303 22/12/2025

Mattermost Jira plugin user spoofing enables Jira request forgery.

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enabled and Mattermost Jira plugin versions <=4.4.0 fail to enforce authentication and issue-key path restrictions in the Jira plugin, which allows an unauthenticated attacker who knows a valid user ID to issue authenticated GET and POST requests to the Jira server via crafted plugin payloads that spoof the user ID and inject arbitrary issue key paths. Mattermost Advisory ID: MMSA-2025-00555

CVE-2025-13326 Baixa · 3.9 CWE-693 17/12/2025

Mattermost Desktop App fails to enable Hardened Runtime when packaged for Mac App Store

Mattermost Desktop App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged for Mac App Store which allows an attacker to inherit TCC permissions via copying the binary to a tmp folder.

CVE-2025-13324 Baixa · 3.7 CWE-863 17/12/2025

Lack of Invalidation of Legacy Remote Cluster Invite Tokens After Confirmation

Mattermost versions 10.11.x <= 10.11.5, 11.0.x <= 11.0.4, 10.12.x <= 10.12.2 fail to invalidate remote cluster invite tokens when using the legacy (version 1) protocol or when the confirming party does not provide a refreshed token, which allows an attacker who has obtained an invite token to authenticate as the remote cluster and perform limited actions on shared channels even after the invitation has been legitimately confirmed.

CVE-2025-13321 Baixa · 3.3 CWE-532 17/12/2025

Mattermost Desktop App logging sensitive information and fails to clear data on server deletion

Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on server deletion which allows an attacker with access to the users system to gain access to potentially sensitive information via reading the application logs.

CVE-2025-12689 Média · 6.5 CWE-1287 17/12/2025

DoS in Calls plugin via malformed UTF-8 in WebSocket request

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

CVE-2025-62690 Média · 6.1 CWE-601 17/12/2025

Open redirect in error page when link opened in new tab

Mattermost versions 10.11.x <= 10.11.4 fail to validate redirect URLs on the /error page, which allows an attacker to redirect a victim to a malicious site via a crafted link opened in a new tab.

CVE-2025-62190 Média · 4.3 CWE-352 17/12/2025

CSRF Allows Call Initiation and Message Delivery

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 and Mattermost Calls versions <=1.10.0 fail to implement CSRF protection on the Calls widget page which allows an authenticated attacker to initiate calls and inject messages into channels or direct messages via a malicious webpage or crafted link

CVE-2025-13352 Baixa · 3.0 CWE-1287 17/12/2025

Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking

Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.

CVE-2025-13870 Média · 4.3 CWE-306 02/12/2025

Unauthorized access and subscription vulnerability in Boards

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

CVE-2025-12756 Média · 4.3 CWE-863 01/12/2025

Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.

CVE-2025-12421 Crítica · 9.9 CWE-303 27/11/2025

Account Takeover via Code Exchange Endpoint

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).

CVE-2025-12559 Média · 4.3 CWE-200 27/11/2025

Information Disclosure in Common Teams API

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint

CVE-2025-12419 Crítica · 9.9 CWE-303 27/11/2025

Account takeover on OAuth/OpenID-enabled servers

Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.

CVE-2025-55074 Baixa · 3.5 18/11/2025

Channel member objects leak read status

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects

CVE-2025-11794 Média · 4.9 CWE-200 14/11/2025

Password hash and MFA secret returned in user email verification endpoint

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to sanitize user data which allows system administrators to access password hashes and MFA secrets via the POST /api/v4/users/{user_id}/email/verify/member endpoint

CVE-2025-55073 Média · 5.3 CWE-306 14/11/2025

MS Teams plugin OAuth allows editing arbitrary posts

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

CVE-2025-55070 Alta · 7.5 CWE-306 14/11/2025

Lack of MFA enforcement in WebSocket connections

Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events

CVE-2025-41436 Média · 4.3 CWE-863 14/11/2025

Unauthorized access to archived channel content via threads interface

Mattermost versions <11.0 fail to properly enforce the "Allow users to view archived channels" setting which allows regular users to access archived channel content and files via the "Open in Channel" functionality from followed threads

CVE-2025-11776 Média · 4.3 CWE-863 14/11/2025

Guest user can discover archived public channels

Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint

CVE-2025-59480 Média · 6.5 CWE-352 13/11/2025

Inadequate validation of SSO redirect credentials permits credential theft

Mattermost Mobile Apps versions <=2.32.0 fail to verify that SSO redirect tokens originate from the trusted server, which allows a malicious Mattermost instance or on-path attacker to obtain user session credentials via crafted token-in-URL responses

CVE-2025-11777 Média · 4.3 CWE-863 13/11/2025

Cross-team channel membership access

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint

CVE-2025-55035 Média · 6.1 CWE-754 16/10/2025

Mattermost Desktop DoS when user has basic authentication server configured

Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a server that uses basic authentication from accessing their server which allows an attacker that provides a malicious server to the user to deny use of the Desktop App via having the user configure the malicious server and forcing a modal popup that cannot be closed.