Filtered by vendor Mattermost
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Filtered by product Mattermost
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Total
230 CVE
| CVE | Vendors | Products | Updated | CVSS v3.1 |
|---|---|---|---|---|
| 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 | ||||
| CVE-2026-20719 | 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 prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595 | ||||
| CVE-2026-27659 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-27 | 4.6 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 properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request.. Mattermost Advisory ID: MMSA-2026-00578 | ||||
| CVE-2026-4274 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-27 | 5.4 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 restrict team-level access when processing membership sync from a remote cluster, which allows a malicious remote cluster to grant a user access to an entire private team instead of only the shared channel via sending crafted membership sync messages that trigger team membership assignment. Mattermost Advisory ID: MMSA-2026-00574 | ||||
| CVE-2026-3108 | 1 Mattermost | 1 Mattermost | 2026-03-27 | 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 | 1 Mattermost | 2026-03-27 | 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-2026-3116 | 1 Mattermost | 1 Mattermost | 2026-03-27 | 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-2026-3114 | 1 Mattermost | 1 Mattermost | 2026-03-27 | 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 | 1 Mattermost | 2026-03-27 | 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-2026-3109 | 1 Mattermost | 1 Mattermost | 2026-03-27 | 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-2026-3112 | 1 Mattermost | 1 Mattermost | 2026-03-27 | 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-2026-24692 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 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 enforce read permissions in search API endpoints which allows guest users without read permissions to access posts and files in channels via search API requests. Mattermost Advisory ID: MMSA-2025-00554 | ||||
| CVE-2026-26304 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 4.3 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2 fail to verify run_create permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542 | ||||
| CVE-2026-2454 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 5.8 Medium |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537 | ||||
| CVE-2026-26230 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 3.8 Low |
| Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531 | ||||
| CVE-2026-1629 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 4.3 Medium |
| Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580 | ||||
| CVE-2026-25780 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 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 DOC files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted DOC file.. Mattermost Advisory ID: MMSA-2026-00581 | ||||
| CVE-2026-21386 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 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 use consistent error responses when handling the /mute command which allows an authenticated team member to enumerate private channels they are not authorized to know about via differing error messages for nonexistent versus private channels. Mattermost Advisory ID: MMSA-2026-00588 | ||||
| CVE-2026-2455 | 1 Mattermost | 2 Mattermost, Mattermost Server | 2026-03-24 | 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 canonicalize IPv4-mapped IPv6 addresses before reserved IP validation which allows an attacker to perform SSRF attacks against internal services via IPv4-mapped IPv6 literals (e.g., [::ffff:127.0.0.1]).. Mattermost Advisory ID: MMSA-2026-00585 | ||||