CVE-2026-3524

Mattermost Plugin Legal Hold versions =1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID:...

Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization due to a missing return statement after a permission check in the ServeHTTP function. An attacker can gain unauthorized access to, create, download, and delete sensitive legal hold data by sending crafted API...

CVE-2026-3524 Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check

Mattermost Plugin Legal Hold versions =1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID:...

CVE-2026-3524: Missing Authorization

Mattermost Plugin Legal Hold versions =1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID:...

Server-side Request Forgery (SSRF)

Overview @openclaw/mattermost is an OpenClaw Mattermost channel plugin Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the fetch process in multiple channel extensions when outbound requests are made to configured base URLs without proper validation. An...

Incorrect Authorization

Overview @openclaw/mattermost is an OpenClaw Mattermost channel plugin Affected versions of this package are vulnerable to Incorrect Authorization in the auth process. An attacker can gain unauthorized access by sending requests with add-on principals that are not bound to the intended deployment...

Incorrect Authorization

Overview @openclaw/mattermost is an OpenClaw Mattermost channel plugin Affected versions of this package are vulnerable to Incorrect Authorization via the callback process. An attacker can execute unauthorized actions by sending specially crafted requests before sender authorization checks are...

CVE-2026-3109 Missing timestamp validation in Zoom webhook handler

Mattermost Plugins versions =11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584...

CVE-2026-3109

Mattermost Plugins in versions

CVE-2026-3109 Missing timestamp validation in Zoom webhook handler

Mattermost Plugins versions =11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584...

GO-2026-4812 Mattermost fails to verify run_create permission for empty playbookId in github.com/mattermost/mattermost-plugin-playbooks

Mattermost fails to verify runcreate permission for empty playbookId in github.com/mattermost/mattermost-plugin-playbooks...

Authorization Bypass Through User-Controlled Key

Overview Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the comment block modification process. An attacker can alter comments created by other users by leveraging editor permissions without proper authorization checks. Remediation Upgrade...

Authorization Bypass Through User-Controlled Key

Overview Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the comment block modification process. An attacker can alter comments created by other users by leveraging editor permissions without proper authorization checks. Remediation Upgrade...

CVE-2026-2462 Admin RCE via Malicious Plugin Upload on CI Test Instances

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to restrict plugin installation on CI test instances with default admin credentials which allows an unauthenticated attacker to achieve remote code execution and exfiltrate sensitive configuration data including AWS and...

CVE-2026-2476 MS Teams plugin sensitive config values not properly masked in support packets

Mattermost Plugins versions =2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606...

CVE-2026-2476

Mattermost Plugins

CVE-2026-2476 MS Teams plugin sensitive config values not properly masked in support packets

Mattermost Plugins versions =2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606...

Incorrect Authorization

Overview @openclaw/mattermost is an OpenClaw Mattermost channel plugin Affected versions of this package are vulnerable to Incorrect Authorization through improper access control in the pairing store process. An attacker can gain unauthorized access to another account's direct message pairing by...

GO-2026-4525 Mattermost Plugin Zoom fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint in github.com/mattermost/mattermost-plugin-zoom

Mattermost Plugin Zoom fail to validate user identity and post ownership in the /api/v1/askPMI endpoint in github.com/mattermost/mattermost-plugin-zoom...

GO-2026-4519 Mattermost Plugin Zoom allows any logged-in user to change Zoom meeting restrictions for arbitrary channels in github.com/mattermost/mattermost-plugin-zoom

Mattermost Plugin Zoom allows any logged-in user to change Zoom meeting restrictions for arbitrary channels in github.com/mattermost/mattermost-plugin-zoom...