Github.Com Mattermost Mattermost-Server V6 vulnerabilities

CVE-2023-48369 [MEDIUM] CWE-400 Mattermost Uncontrolled Resource Consumption vulnerability Mattermost Uncontrolled Resource Consumption vulnerability 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.

CVE-2023-1777 [MEDIUM] CWE-668 Mattermost vulnerable to information disclosure Mattermost vulnerable to information disclosure 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.

CVE-2023-1774 [MEDIUM] CWE-862 Mattermost fails to properly authentication inviter's permissions to private channel Mattermost fails to properly authentication inviter's permissions to 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. [Issue Identifier](https://mattermost.com/security-updates/): MMSA-2023-00137

CVE-2023-6459 [MEDIUM] CWE-200 Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost is grouping calls in the /metrics endpoint by id and reports that id in the response. Since this id is the channelID, the public /metrics endpoint is revealing channelIDs.

CVE-2023-5195 [MEDIUM] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability 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

CVE-2025-8402 [MEDIUM] CWE-476 Mattermost has Potential Server Crash due to Unvalidated Import Data Mattermost has Potential Server Crash due to Unvalidated Import Data Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.

CVE-2025-11776 [MEDIUM] CWE-863 Mattermost fails to properly restrict access to archived channel search API Mattermost fails to properly restrict access to archived channel search API 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-2023-47168 [MEDIUM] CWE-601 Mattermost Open Redirect vulnerability Mattermost Open Redirect vulnerability Mattermost fails to properly check a redirect URL parameter allowing for an open redirect was possible when the user clicked "Back to Mattermost" after providing a invalid custom url scheme in /oauth/{service}/mobile_login?redirect_to=

CVE-2023-35075 [LOW] CWE-74 Mattermost Injection vulnerability Mattermost Injection vulnerability Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though.

CVE-2023-5968 [MEDIUM] CWE-116 Mattermost password hash disclosure vulnerability Mattermost password hash disclosure vulnerability Mattermost fails to properly sanitize the user object when updating the username, resulting in the password hash being included in the response body.

CVE-2022-1385 [MEDIUM] CWE-664 Improper Control of a Resource Through its Lifetime in Mattermost Improper Control of a Resource Through its Lifetime in Mattermost Mattermost 6.4.x and earlier fails to properly invalidate pending email invitations when the action is performed from the system console, which allows accidentally invited users to join the workspace and access information from the public teams and channels.

CVE-2022-1332 [MEDIUM] CWE-200 Improper Privilege Management in Mattermost Improper Privilege Management in Mattermost 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. Per the Mattermost security updates page, versions 6.4.2, 6.3.5, 6.2.5, and 5.37.9 contain patches for this issue

CVE-2023-5194 [MEDIUM] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability Mattermost fails to properly validate permissions when demoting and deactivating a user allowing for a system/user manager to demote / deactivate another manager

CVE-2025-47870 [MEDIUM] CWE-306 Mattermost Does Not Sanitize the Team Invite ID Mattermost Does Not Sanitize the Team Invite ID Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2 fail to sanitize the team invite ID in the POST /api/v4/teams/:teamId/restore endpoint which allows an team admin with no member invite privileges to get the team’s invite id.

CVE-2025-11777 [LOW] CWE-863 Mattermost Incorrect Authorization vulnerability Mattermost Incorrect Authorization vulnerability 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-2023-6202 [MEDIUM] CWE-284 Mattermost Improper Access Control vulnerability Mattermost Improper Access Control vulnerability Mattermost fails to perform proper authorization in the `/plugins/focalboard/api/v2/users` endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.

CVE-2023-5967 [MEDIUM] CWE-754 Mattermost denial of service vulnerability Mattermost denial of service vulnerability 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

CVE-2023-45223 [MEDIUM] CWE-200 Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability 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.

CVE-2023-43754 [MEDIUM] CWE-200 Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability Mattermost fails to check whether the "Allow users to view archived channels" setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the "Allow users to view archived channels" setting is disabled.

CVE-2023-47865 [MEDIUM] CWE-284 Mattermost Improper Access Control vulnerability Mattermost Improper Access Control vulnerability 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 icon when making a post even if the Hardened Mode setting was enabled