Filtered by vendor Mattermost
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Filtered by product Mattermost
Subscriptions
Total
274 CVE
| CVE | Vendors | Products | Updated | CVSS v3.1 |
|---|---|---|---|---|
| CVE-2026-0999 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-04-17 | 5.4 Medium |
| Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login method restrictions which allows an authenticated user to bypass SSO-only login requirements via userID-based authentication. Mattermost Advisory ID: MMSA-2025-00548 | ||||
| CVE-2026-0998 | 1 Mattermost | 3 Mattermost, Mattermost Server, Zoom | 2026-04-17 | 4.3 Medium |
| Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534 | ||||
| CVE-2026-0997 | 1 Mattermost | 3 Mattermost, Mattermost Server, Zoom | 2026-04-17 | 4.3 Medium |
| Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate the authenticated user when processing {{/plugins/zoom/api/v1/channel-preference}}, which allows any logged-in user to change Zoom meeting restrictions for arbitrary channels via crafted API requests.. Mattermost Advisory ID: MMSA-2025-00558 | ||||
| CVE-2026-1628 | 1 Mattermost | 2 Mattermost, Mattermost Desktop | 2026-04-16 | 4.6 Medium |
| Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596 | ||||
| CVE-2026-3524 | 1 Mattermost | 1 Mattermost | 2026-04-07 | 8.3 High |
| 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: MMSA-2026-00621 | ||||
| CVE-2026-3108 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-31 | 8 High |
| Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences that enable screen manipulation, fake prompts, and clipboard hijacking.. Mattermost Advisory ID: MMSA-2026-00599 | ||||
| CVE-2026-3113 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-30 | 5 Medium |
| Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to set permissions on downloaded bulk export which allows other local users on the server to be able to read contents of the bulk export.. Mattermost Advisory ID: MMSA-2026-00593 | ||||
| CVE-2026-3114 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-30 | 6.5 Medium |
| Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory.. Mattermost Advisory ID: MMSA-2026-00598 | ||||
| CVE-2026-3115 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-30 | 4.3 Medium |
| Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to apply view restrictions when retrieving group member IDs, which allows authenticated guest users to enumerate user IDs outside their allowed visibility scope via the group retrieval endpoint.. Mattermost Advisory ID: MMSA-2026-00594 | ||||
| CVE-2026-3112 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-30 | 6.8 Medium |
| Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562 | ||||
| CVE-2026-3109 | 1 Mattermost | 1 Mattermost | 2026-03-30 | 2.2 Low |
| 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-2026-3116 | 1 Mattermost | 1 Mattermost | 2026-03-30 | 4.9 Medium |
| Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589 | ||||
| CVE-2026-2456 | 1 Mattermost | 3 Mattermost, Mattermost Server, Server | 2026-03-30 | 5.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the size of responses from integration action endpoints, which allows an authenticated attacker to cause server memory exhaustion and denial of service via a malicious integration server that returns an arbitrarily large response when a user clicks an interactive message button.. Mattermost Advisory ID: MMSA-2026-00571 | ||||
| CVE-2026-2463 | 1 Mattermost | 3 Mattermost, Mattermost Server, Server | 2026-03-30 | 4.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation.. Mattermost Advisory ID: MMSA-2025-00565 | ||||
| CVE-2026-2457 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-30 | 4.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID: MMSA-2025-00569 | ||||
| CVE-2026-26246 | 1 Mattermost | 3 Mattermost, Mattermost Server, Server | 2026-03-30 | 4.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when processing PSD image files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted PSD file. Mattermost Advisory ID: MMSA-2026-00572 | ||||
| CVE-2026-25783 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-30 | 4.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header tokens which allows an authenticated attacker to cause a request panic via a specially crafted User-Agent header. Mattermost Advisory ID: MMSA-2026-00586 | ||||
| CVE-2026-4265 | 1 Mattermost | 3 Mattermost, Mattermost Server, Server | 2026-03-30 | 4.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to validate team-specific upload_file permissions which allows a guest user to post files in channels where they lack upload_file permission via uploading files in a team where they have permission and reusing the file metadata in a POST request to a different team. Mattermost Advisory ID: MMSA-2025-00553 | ||||
| CVE-2026-26233 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-27 | 4.3 Medium |
| Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to rate limit login requests which allows unauthenticated remote attackers to cause denial of service (server crash and restart) via HTTP/2 single packet attack with 100+ parallel login requests.. Mattermost Advisory ID: MMSA-2025-00566 | ||||
| CVE-2026-27656 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-27 | 5.7 Medium |
| Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590 | ||||