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Mattermost Server

mattermost_server

Vendor: Mattermost • 452 CVEs

CVEs (452)

CVE
VENDORS
PRODUCTS
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PUBLISHED
CVSS
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 29, 2023
N/A· v4
6.1 MEDIUM· v3
N/A· v2
Mattermost version 8.1.6 and earlier fails to sanitize channel mention data in posts, which allows an attacker to inject markup in the web client.
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
Mattermost fails to perform correct authorization checks when creating a playbook action, allowing users without access to the playbook to create playbook actions. If the playbook action created is to post a message in a...Show more
Mattermost fails to perform correct authorization checks when creating a playbook action, allowing users without access to the playbook to create playbook actions. If the playbook action created is to post a message in a channel based on specific keywords in a post, some playbook information, like the name, can be leaked.  Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
5.4 MEDIUM· v3
N/A· v2
Mattermost fails to validate team membership when a user attempts to access a playbook, allowing a user with permissions to a playbook but no permissions to the team the playbook is on to access and modify the playbook....Show more
Mattermost fails to validate team membership when a user attempts to access a playbook, allowing a user with permissions to a playbook but no permissions to the team the playbook is on to access and modify the playbook. This can happen if the user was once a member of the team, got permissions to the playbook and was then removed from the team.  Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
Mattermost fails to check whether a user is a guest when updating the tasks of a private playbook run allowing a guest to update the tasks of a private playbook run if they know the run ID.
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
6.5 MEDIUM· v3
N/A· v2
Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled....Show more
Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled.  Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
7.5 HIGH· v3
N/A· v2
Mattermost fails to validate the type of the "reminder" body request parameter allowing an attacker to crash the Playbook Plugin when updating the status dialog.
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
5.3 MEDIUM· v3
N/A· v2
Mattermost fails to perform authorization checks in the /plugins/playbooks/api/v0/runs/add-to-timeline-dialog endpoint of the Playbooks plugin allowing an attacker to get limited information about a post if they know th...Show more
Mattermost fails to perform authorization checks in the /plugins/playbooks/api/v0/runs/add-to-timeline-dialog endpoint of the Playbooks plugin allowing an attacker to get limited information about a post if they know the post ID Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
7.5 HIGH· v3
N/A· v2
Mattermost fails to to check the length when setting the title in a run checklist in Playbooks, allowing an attacker to send a specially crafted request and crash the Playbooks plugin
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 12, 2023
N/A· v4
8.8 HIGH· v3
N/A· v2
Mattermost fails to validate if a relative path is passed in /plugins/playbooks/api/v0/telemetry/run/<telem_run_id> as a telemetry run ID, allowing an attacker to use a path traversal payload that points to a different e...Show more
Mattermost fails to validate if a relative path is passed in /plugins/playbooks/api/v0/telemetry/run/<telem_run_id> as a telemetry run ID, allowing an attacker to use a path traversal payload that points to a different endpoint leading to a CSRF attack. Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 6, 2023
N/A· v4
5.3 MEDIUM· v3
N/A· v2
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.
1Mattermost
1Mattermost Server
Jun 17, 2026
Dec 6, 2023
N/A· v4
9.8 CRITICAL· v3
N/A· v2
Mattermost webapp fails to validate route parameters in/<TEAM_NAME>/channels/<CHANNEL_NAME> allowing an attacker to perform a client-side path traversal.
1Mattermost
1Mattermost Server
Jun 17, 2026
Oct 9, 2023
N/A· v4
6.5 MEDIUM· v3
N/A· v2
Mattermost fails to deduplicate input IDs allowing a simple user to cause the application to consume excessive resources and possibly crash by sending a specially crafted request to /api/v4/users/ids with multiple identi...Show more
Mattermost fails to deduplicate input IDs allowing a simple user to cause the application to consume excessive resources and possibly crash by sending a specially crafted request to /api/v4/users/ids with multiple identical IDs. Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Oct 9, 2023
N/A· v4
5.3 MEDIUM· v3
N/A· v2
Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information.
1Mattermost
1Mattermost Server
Jun 17, 2026
Oct 9, 2023
N/A· v4
7.5 HIGH· v3
N/A· v2
Mattermost fails to enforce a limit for the size of the cache entry for OpenGraph data allowing an attacker to send a specially crafted request to the /api/v4/opengraph filling the cache and turning the server unavailab...Show more
Mattermost fails to enforce a limit for the size of the cache entry for OpenGraph data allowing an attacker to send a specially crafted request to the /api/v4/opengraph filling the cache and turning the server unavailable. Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Aug 25, 2023
N/A· v4
8.2 HIGH· v3
N/A· v2
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 admi...Show more
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. Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Jul 17, 2023
N/A· v4
3.3 LOW· v3
N/A· v2
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 craf...Show more
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. Show less
1Mattermost
1Mattermost Server
Jun 17, 2026
Jul 17, 2023
N/A· v4
3.5 LOW· v3
N/A· v2
Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding users to channels allowing guest accounts to be added or invited to channels by default.
1Mattermost
1Mattermost Server
Jun 17, 2026
Jul 17, 2023
N/A· v4
6.5 MEDIUM· v3
N/A· v2
Mattermost fails to properly validate markdown, allowing an attacker to crash the server via a specially crafted markdown input.
1Mattermost
1Mattermost Server
Jun 17, 2026
Jul 17, 2023
N/A· v4
8.2 HIGH· v3
N/A· v2
Mattermost fails to invalidate previously generated password reset tokens when a new reset token was created.
1Mattermost
1Mattermost Server
Jun 17, 2026
Jul 17, 2023
N/A· v4
7.5 HIGH· v3
N/A· v2
Mattermost fails to delete card attachments in Boards, allowing an attacker to access deleted attachments.