CVE-2026-27152 DIscourse has DM communication-preference bypass when adding members

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, DM communication-preference bypass when adding members via Chat::AddUsersToChannel — a user could add targets who have blocked/ignored/muted them to an existing DM channel, bypassing per-recipien...

GO-2025-4259 Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server

Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. ...

GO-2026-4495 Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server

Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server...

Mattermost doesn't properly validate channel membership at the time of data retrieval

Mattermost versions 10.11.x = 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /commonteams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Versions of Mattermost 10.11.9 and earlier, including 10.11.x, have security vulnerabilities. These vulnerabilities stem from improper verification of channel membership during data retrieval, which...

GO-2025-4256 Mattermost has an Invite Token Replay Vulnerability via Channel Membership Manipulation in github.com/mattermost/mattermost

Mattermost has an Invite Token Replay Vulnerability via Channel Membership Manipulation in github.com/mattermost/mattermost...

CVE-2025-13767

Mattermost versions 11.1.x = 11.1.0, 11.0.x = 11.0.5, 10.12.x = 10.12.3, 10.11.x = 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachmen...

GHSA-FMQF-PMCM-8CX9 Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues

Mattermost versions 11.1.x = 11.1.0, 11.0.x = 11.0.5, 10.12.x = 10.12.3, 10.11.x = 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachmen...

Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues

Mattermost versions 11.1.x = 11.1.0, 11.0.x = 11.0.5, 10.12.x = 10.12.3, 10.11.x = 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachmen...

CVE-2025-13767

Mattermost versions 11.1.x = 11.1.0, 11.0.x = 11.0.5, 10.12.x = 10.12.3, 10.11.x = 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachmen...

CVE-2025-13767 Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin

Mattermost versions 11.1.x = 11.1.0, 11.0.x = 11.0.5, 10.12.x = 10.12.3, 10.11.x = 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachmen...

EUVD-2025-205063

Mattermost versions 11.1.x = 11.1.0, 11.0.x = 11.0.5, 10.12.x = 10.12.3, 10.11.x = 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachmen...

CVE-2025-13767

Mattermost Jira plugin vulnerability (CVE-2025-13767): versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x

Mattermost 安全漏洞

Mattermost is an open source collaboration platform from Mattermost, Inc. in the United States. A security vulnerability exists in Mattermost versions 11.1.0 and prior to 11.1.x, 11.0.5 and prior to 11.0.x, 10.12.3 and prior to 10.12.x, and 10.11.7 and prior to 10.11.x, which stems from a failure...

PT-2025-52872

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.7 Mattermost versions 10.12.x through 10.12.3 Mattermost versions 11.0.x through 11.0.5 Mattermost versions 11.1.x through 11.1.0 Description The software does not properly validate user channel...

GHSA-X3R8-2HMH-89F5 Mattermost has an Invite Token Replay Vulnerability via Channel Membership Manipulation

Mattermost versions 10.11.x 10.11.5, 11.0.x 11.0.4, 10.12.x 10.12.2 fail to invalidate remote cluster invite tokens when using the legacy version 1 protocol or when the confirming party does not provide a refreshed token, which allows an attacker who has obtained an invite token to authenticate a...

PT-2025-51854

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.5 Mattermost versions 11.0.x through 11.0.4 Mattermost versions 10.12.x through 10.12.2 Description The software does not invalidate invite tokens after they are used. This allows a malicious actor who...

Mattermost 安全漏洞

Mattermost is an open source collaboration platform from Mattermost, Inc. in the United States. A security vulnerability exists in Mattermost versions 10.11.5 and prior to 10.11.x, 11.0.4 and prior to 11.0.x, and 10.12.2 and prior to 10.12.x, which stems from a failure to invalidate an invitation...

Mattermost Server 10.5.x < 10.5.12 / 10.11.x 10.11.4 / 11.0.0 Missing Authorization (MMSA-2025-00518)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00518 advisory. - Mattermost versions 10.11.x = 10.11.3, 10.5.x = 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows...

CVE-2025-11777

Mattermost versions 10.11.x = 10.11.3, 10.5.x = 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint...