Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is caused due to a failure to disallow users to set their own remote username when shared channels are enabled. This allows a user on a remote to set their remote username prop to an arbitrary...

Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is due to inadequate validation when shared channels are enabled, allowing an attacker to create, update, or delete arbitrary posts in arbitrary channels...

Mattermost Server 9.0.x < 9.9.1 / 9.10.0 / 9.5.x < 9.5.7 (MMSA-2024-00356)

The version of Mattermost Server installed on the remote host is prior to 9.5.7 or 9.9.1 / 9.10.0. It is, therefore, affected by a vulnerability as referenced in the MMSA-2024-00356 advisory. - Mattermost versions 9.9.x = 9.9.0, 9.5.x = 9.5.6 fail to properly validate synced reactions, when share...

Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is caused due to a failure to properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled. This allows a malicious remote user to add...

Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is due to the failure to disallow unsolicited invites when shared channels are enabled, This allowing an attacker to send an invite with the ID of an existing local channel, causing that local...

GO-2024-3025 Mattermost failed to disallow the modification of local users when syncing users in shared channels in github.com/mattermost/mattermost-server

Mattermost failed to disallow the modification of local users when syncing users in shared channels in github.com/mattermost/mattermost-server...

GO-2024-3028 Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel in github.com/mattermost/mattermost-server

Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel in github.com/mattermost/mattermost-server...

GO-2024-3023 Mattermost allows remote actor to create/update/delete posts in arbitrary channels in github.com/mattermost/mattermost-server

Mattermost allows remote actor to create/update/delete posts in arbitrary channels in github.com/mattermost/mattermost-server...

Stable Channel Update for Desktop

The Stable channel has been updated to 127.0.6533.99/.100 for Windows, Mac and 127.0.6533.99 for Linux which will roll out over the coming days/weeks. A full list of changes in this build is available in the Log. Security Fixes and Rewards Note: Access to bug details and links may be kept...

GHSA-VG67-CHM7-8M3J Mattermost allows remote actor to create/update/delete posts in arbitrary channels

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 validate synced posts, when shared channels are enabled, which allows a malicious remote to create/update/delete arbitrary posts in arbitrary channels...

GHSA-JR9X-3X7M-4J75 Mattermost allows a remote actor to make an arbitrary local channel read-only

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 the modification of local channels by a remote, when shared channels are enabled, which allows a malicious remote to make an arbitrary local channel read-only...

GHSA-Q22Q-2RRF-M27P Mattermost allows unsolicited invites to expose access to local channels

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 remote to send an invite with the ID of an existing local channel, and that local...

GHSA-VVPG-55P7-5H8W Mattermost did not properly restrict channel creation

Mattermost versions 9.9.x = 9.9.0, 9.5.x = 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled...

Mattermost allows remote actor to create/update/delete posts in arbitrary channels

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 validate synced posts, when shared channels are enabled, which allows a malicious remote to create/update/delete arbitrary posts in arbitrary channels...

Mattermost allows a user on a remote to set their remote username prop to an arbitrary string

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 users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the...

Mattermost allows unsolicited invites to expose access to local channels

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 remote to send an invite with the ID of an existing local channel, and that local...

Mattermost did not properly restrict channel creation

Mattermost versions 9.9.x = 9.9.0, 9.5.x = 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled...

Mattermost allows a remote actor to permanently delete local data by abusing dangerous error handling

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 handling, when share channels were enabled...

GHSA-762M-4CX6-6MF4 Mattermost allows a remote actor to permanently delete local data by abusing dangerous error handling

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 handling, when share channels were enabled...

GHSA-JQ3G-XQPX-37X3 Mattermost failed to properly validate synced reactions

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...