Filtered by vendor Mattermost
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Total
660 CVE
| CVE | Vendors | Products | Updated | CVSS v2 | CVSS v3 |
|---|---|---|---|---|---|
| CVE-2025-9076 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 6.5 MEDIUM |
| Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled. | |||||
| CVE-2025-9072 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 7.6 HIGH |
| Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL. | |||||
| CVE-2025-9078 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 4.3 MEDIUM |
| Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing | |||||
| CVE-2025-58075 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 8.1 HIGH |
| Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the RelayState | |||||
| CVE-2025-41443 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 4.3 MEDIUM |
| Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint | |||||
| CVE-2025-58073 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 8.1 HIGH |
| Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the OAuth state. | |||||
| CVE-2025-58084 | 1 Mattermost | 1 Mattermost Desktop | 2026-10-19 | N/A | 3.5 LOW |
| Mattermost Desktop App versions <= 5.13.0 fail to validate URLs external to the configured Mattermost servers, allowing an attacker on a server the user has configured to crash the user's application by sending the user a malformed URL. | |||||
| CVE-2025-41410 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 5.4 MEDIUM |
| Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions | |||||
| CVE-2025-9079 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 8.0 HIGH |
| Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to validate import directory path configuration which allows admin users to execute arbitrary code via malicious plugin upload to prepackaged plugins directory | |||||
| CVE-2025-54499 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 3.1 LOW |
| Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to use constant-time comparison for sensitive string comparisons which allows attackers to exploit timing oracles to perform byte-by-byte brute force attacks via response time analysis on Cloud API keys and OAuth client secrets | |||||
| CVE-2025-9081 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 3.1 LOW |
| Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration | |||||
| CVE-2025-55035 | 1 Mattermost | 1 Mattermost Desktop | 2026-10-19 | N/A | 6.1 MEDIUM |
| Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a server that uses basic authentication from accessing their server which allows an attacker that provides a malicious server to the user to deny use of the Desktop App via having the user configure the malicious server and forcing a modal popup that cannot be closed. | |||||
| CVE-2025-10545 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 3.1 LOW |
| Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint | |||||
| CVE-2025-11776 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 4.3 MEDIUM |
| Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint | |||||
| CVE-2025-12419 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 9.9 CRITICAL |
| Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost. | |||||
| CVE-2025-12421 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 9.9 CRITICAL |
| Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled). | |||||
| CVE-2025-55074 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 3.0 LOW |
| Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects | |||||
| CVE-2025-59480 | 1 Mattermost | 1 Mattermost Mobile | 2026-10-19 | N/A | 6.1 MEDIUM |
| Mattermost Mobile Apps versions <=2.32.0 fail to verify that SSO redirect tokens originate from the trusted server, which allows a malicious Mattermost instance or on-path attacker to obtain user session credentials via crafted token-in-URL responses | |||||
| CVE-2025-12756 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 4.3 MEDIUM |
| Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users. | |||||
| CVE-2025-55070 | 1 Mattermost | 1 Mattermost Server | 2026-10-19 | N/A | 6.5 MEDIUM |
| Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events | |||||