Priority LOW 29
Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversi…
CVSS 3.1MEDIUM 6.5· Network · Low privileges · No interaction · EPSS 0.00317 · Published 2026-04-09 · Fixed in 2.3.2.0, 1.15.1-0.20260213190728-6fe4d295592e CWE-770
Priority LOW 17
Mattermost versions 9.11.X <= 9.11.1, 9.5.x <= 9.5.9 icorrectly issues two sessions when using desktop SSO - one in the browser and one in desktop with incorrect settings.
CVSS 3.1LOW 3.5· Network · Low privileges · User interaction · EPSS 0.00383 · Published 2024-10-28 · Fixed in 10.0.0, 9.11.2 +2 CWE-303
Priority LOW 32
Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to restrict which roles can promote a user as system admin which allows a System Role with edit access to the permissions secti…
CVSS 3.1HIGH 7.2· Network · High privileges · No interaction · EPSS 0.00344 · Published 2024-08-22 · Fixed in 9.11.0, 9.9.2 +3 CWE-284
Priority LOW 30
Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0, 9.8.x <= 9.8.2 fail to restrict the input in POST /api/v4/users which allows a user to manipulate the creation date in POST /api/v4/users tricking the…
CVSS 3.1MEDIUM 5.3· Network · No auth · No interaction · EPSS 0.00291 · Published 2024-08-22 · Fixed in 9.11.0, 9.9.2 +3 CWE-754
Priority LOW 37
Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0, 9.8.x <= 9.8.2 fail to sanitize user inputs in the frontend that are used for redirection which allows for a one-click client-side path traversal that…
CVSS 3.1HIGH 8.8· Network · No auth · User interaction · EPSS 0.00201 · Published 2024-08-22 · Fixed in 9.11.0, 9.9.2 +3 CWE-352
Priority LOW 20
Mattermost versions 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 fail to enforce proper access controls which allows any authenticated user, including guests, to mark any channel inside any team as read for any user.
CVSS 3.1MEDIUM 4.3· Network · Low privileges · No interaction · EPSS 0.00244 · Published 2024-08-22 · Fixed in 9.11.0, 9.5.8 +1 CWE-284
Priority LOW 23
Mattermost versions 9.5.x <= 9.5.7 and 9.10.x <= 9.10.0 fail to time limit and size limit the CA path file in the ElasticSearch configuration which allows a System Role with access to the Elasticsearch system console to…
CVSS 3.1MEDIUM 4.9· Network · High privileges · No interaction · EPSS 0.00456 · Published 2024-08-22 · Fixed in 9.11.0, 9.5.8 +1 CWE-400
Priority LOW 19
Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0, 9.8.x <= 9.8.2, when shared channels are enabled, fail to redact remote users' original email addresses stored in user props when email addresses are…
CVSS 3.1MEDIUM 4.3· Network · Low privileges · No interaction · EPSS 0.0022 · Published 2024-08-22 · Fixed in 9.11.0, 9.9.2 +3 CWE-284
Priority LOW 28
Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, creat…
CVSS 3.1MEDIUM 6.5· Network · No auth · No interaction · EPSS 0.00261 · Published 2024-08-22 · Fixed in 9.11.0, 9.9.2 +3 CWE-693
Priority LOW 38
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to properly safeguard an error handling which allows a malicious remote to permanently delete local data by abusing dangerous error…
CVSS 3.1HIGH 8.7· Network · High privileges · No interaction · EPSS 0.0046 · Published 2024-08-01 · Fixed in 9.10.0, 9.9.1 +3 CWE-754
Priority MEDIUM 43
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious re…
CVSS 3.1CRITICAL 9.6· Network · Low privileges · No interaction · EPSS 0.00363 · Published 2024-08-01 · Fixed in 9.10.0, 9.9.1 +4 CWE-284
Priority MEDIUM 40
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled, whi…
CVSS 3.1HIGH 8.7· Network · High privileges · No interaction · EPSS 0.00341 · Published 2024-08-01 · Fixed in 9.10.0, 9.9.1 +3 CWE-284
Priority LOW 32
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow the modification of local users when syncing users in shared channels.
CVSS 3.1HIGH 7.4· Network · Low privileges · No interaction · EPSS 0.00296 · Published 2024-08-01 · Fixed in 9.10.0, 9.9.1 +3 CWE-284
Priority LOW 20
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly validate synced reactions, when shared channels are enabled, which allows a malicious remote to create arbitrary reactions on arbitrary posts
CVSS 3.1MEDIUM 4.3· Network · Low privileges · No interaction · EPSS 0.00276 · Published 2024-08-01 · Fixed in 9.10.0, 9.9.1 +1 CWE-284
Priority LOW 35
Mattermost versions 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2, 9.5.x <= 9.5.5 fail to prevent specifying a RemoteId when creating a new user which allows an attacker to specify both a remoteId and the user ID, resulting in c…
CVSS 3.1MEDIUM 6.5· Network · No auth · No interaction · EPSS 0.00394 · Published 2024-07-03 · Fixed in 9.9.0, 9.8.1 +3 CWE-284
Priority LOW 14
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0 fail to sanitize the RemoteClusterFrame payloads before audit logging them which allows a high privileged attacker with access to the audit logs to read message contents.
CVSS 3.1LOW 2.7· Network · High privileges · No interaction · EPSS 0.00337 · Published 2024-07-03 · Fixed in 9.9.0, 9.8.1 +1 CWE-200
Priority LOW 24
Mattermost versions 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2 and 9.5.x <= 9.5.5 fail to prevent users from specifying a RemoteId for their posts which allows an attacker to specify both a remoteId and the post ID, resulting…
CVSS 3.1MEDIUM 5.4· Network · Low privileges · No interaction · EPSS 0.00277 · Published 2024-07-03 · Fixed in 9.9.0, 9.8.1 +3 CWE-284
Priority LOW 37
Mattermost versions 9.8.x <= 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2 and 9.5.x <= 9.5.5, when shared channels are enabled, fail to use constant time comparison for remote cluster tokens which allows an attacker to retrieve…
CVSS 3.1HIGH 8.1· Network · No auth · No interaction · EPSS 0.00379 · Published 2024-07-03 · Fixed in 9.9.0, 9.8.1 +3 CWE-287
Priority LOW 24
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0 fail to properly sanitize the recipients of a webhook event which allows an attacker monitoring webhook events to retrieve the channel IDs of archived or restored channels.
CVSS 3.1MEDIUM 5.3· Network · No auth · No interaction · EPSS 0.00345 · Published 2024-07-03 · Fixed in 9.9.0, 9.8.1 +1 CWE-200
Priority LOW 24
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…
CVSS 3.1MEDIUM 5.3· Network · No auth · No interaction · EPSS 0.00303 · Published 2024-07-03 · Fixed in 9.9.0, 9.8.1 +1 CWE-284
Priority LOW 38
Mattermost version 2.10.0 and earlier fails to sanitize deeplink paths, which allows an attacker to perform CSRF attacks against the server.
CVSS 3.1HIGH 8.8· Network · No auth · User interaction · EPSS 0.00461 · Published 2023-12-29 · Fixed in 2.10.1 CWE-74
Priority LOW 27
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…
CVSS 3.1MEDIUM 6.1· Network · No auth · User interaction · EPSS 0.00403 · Published 2023-11-27 · Fixed in 9.0.2, 9.1.1 +2 CWE-601
Priority LOW 20
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.
CVSS 3.1MEDIUM 4.3· Network · Low privileges · No interaction · EPSS 0.00443 · Published 2023-11-27 · Fixed in 9.0.2, 9.1.1 +2 CWE-284
Priority LOW 21
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 user…
CVSS 3.1MEDIUM 4.3· Network · Low privileges · No interaction · EPSS 0.00506 · Published 2023-11-27 · Fixed in 9.0.2, 9.1.1 +2 CWE-200
Priority LOW 25
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.
CVSS 3.1MEDIUM 5.3· Network · No auth · No interaction · EPSS 0.00632 · Published 2023-11-27 · Fixed in 9.0.2, 9.1.1 +2 CWE-400
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