Mattermost: >> Mattermost Server >> 7.9.0 Security Vulnerabilities
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
CVSS Score
4.3
EPSS Score
0.004
Published
2024-01-02
Mattermost fails to update the permissions of the current session for a user who was just demoted to guest, allowing freshly demoted guests to change group names.
CVSS Score
3.7
EPSS Score
0.001
Published
2024-01-02
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.
CVSS Score
3.7
EPSS Score
0.006
Published
2023-12-29
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.
CVSS Score
3.1
EPSS Score
0.003
Published
2023-12-12
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.
CVSS Score
4.3
EPSS Score
0.001
Published
2023-12-12
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.
CVSS Score
3.7
EPSS Score
0.002
Published
2023-12-12
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.
CVSS Score
4.3
EPSS Score
0.003
Published
2023-08-25
Mattermost fails to properly validate markdown, allowing an attacker to crash the server via a specially crafted markdown input.
CVSS Score
4.3
EPSS Score
0.001
Published
2023-07-17
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.
CVSS Score
3.5
EPSS Score
0.001
Published
2023-07-17
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.
CVSS Score
4.3
EPSS Score
0.001
Published
2023-07-17