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Mattermost

mattermost

Vendor: Mattermost • 78 CVEs

CVEs (78)

CVE
VENDORS
PRODUCTS
UPDATED
PUBLISHED
CVSS
1Mattermost
1Mattermost
Jun 17, 2026
Jul 3, 2024
N/A· v4
5.3 MEDIUM· v3
N/A· v2
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0, when using shared channels with multiple remote servers connected, fail to check that the remote server A requesting the server B to update the profile picture of a user is t...Show more
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0, when using shared channels with multiple remote servers connected, fail to check that the remote server A requesting the server B to update the profile picture of a user is the remote that actually has the user as a local one . This allows a malicious remote A to change the profile images of users that belong to another remote server C that is connected to the server A.Show less
1Mattermost
1Mattermost
Jun 17, 2026
Dec 29, 2023
N/A· v4
8.8 HIGH· v3
N/A· v2
Mattermost version 2.10.0 and earlier fails to sanitize deeplink paths, which allows an attacker to perform CSRF attacks against the server.
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
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, ni...Show more
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. Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
5.3 MEDIUM· v3
N/A· v2
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.
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
7.5 HIGH· v3
N/A· v2
Mattermost fails to limit the amount of data extracted from compressed archives during board import in Mattermost Boards allowing an attacker to consume excessive resources, possibly leading to Denial of Service, by impo...Show more
Mattermost fails to limit the amount of data extracted from compressed archives during board import in Mattermost Boards allowing an attacker to consume excessive resources, possibly leading to Denial of Service, by importing a board using a specially crafted zip (zip bomb). Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
6.1 MEDIUM· v3
N/A· v2
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_log...Show more
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= Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
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. 
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
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 us...Show more
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.  Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
7.5 HIGH· v3
N/A· v2
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the fie...Show more
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string.  Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
5.4 MEDIUM· v3
N/A· v2
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...Show more
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.  Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 27, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
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...Show more
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 Show less
1Mattermost
1Mattermost
Jun 17, 2026
Nov 6, 2023
N/A· v4
5.3 MEDIUM· v3
N/A· v2
Mattermost fails to properly sanitize the request to /api/v4/redirect_location allowing an attacker, sending a specially crafted request to /api/v4/redirect_location, to fill up the memory due to caching large items.
1Mattermost
1Mattermost
Jun 17, 2026
Nov 6, 2023
N/A· v4
4.9 MEDIUM· v3
N/A· v2
Mattermost fails to properly sanitize the user object when updating the username, resulting in the password hash being included in the response body. 
1Mattermost
1Mattermost
Jun 17, 2026
Nov 6, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
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
1Mattermost
1Mattermost
Jun 17, 2026
Oct 17, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
Mattermost Mobile fails to limit the maximum number of Markdown elements in a post allowing an attacker to send a post with hundreds of emojis to a channel and freeze the mobile app of users when viewing that particular...Show more
Mattermost Mobile fails to limit the maximum number of Markdown elements in a post allowing an attacker to send a post with hundreds of emojis to a channel and freeze the mobile app of users when viewing that particular channel.  Show less
1Mattermost
1Mattermost
Jun 17, 2026
Oct 2, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
Mattermost fails to check the Show Full Name option at the /api/v4/teams/TEAM_ID/top/team_members endpoint allowing a member to get the full name of another user even if the Show Full Name option was disabled
1Mattermost
1Mattermost
Jun 17, 2026
Sep 29, 2023
N/A· v4
6.5 MEDIUM· v3
N/A· v2
Mattermost fails to enforce character limits in all possible notification props allowing an attacker to send a really long value for a notification_prop resulting in the server consuming an abnormal quantity of computing...Show more
Mattermost fails to enforce character limits in all possible notification props allowing an attacker to send a really long value for a notification_prop resulting in the server consuming an abnormal quantity of computing resources and possibly becoming temporarily unavailable for its users. Show less
1Mattermost
1Mattermost
Jun 17, 2026
Sep 29, 2023
N/A· v4
5.4 MEDIUM· v3
N/A· v2
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
1Mattermost
1Mattermost
Jun 17, 2026
Sep 29, 2023
N/A· v4
4.3 MEDIUM· v3
N/A· v2
Mattermost fails to properly validate permissions when demoting and deactivating a user allowing for a system/user manager to demote / deactivate another manager
1Mattermost
1Mattermost
Jun 17, 2026
Sep 29, 2023
N/A· v4
2.7 LOW· v3
N/A· v2
Mattermost fails to properly check permissions when retrieving a post allowing for a System Role with the permission to manage channels to read the posts of a DM conversation.