Filtered by vendor Mattermost
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Total
623 CVE
| CVE | Vendors | Products | Updated | CVSS v2 | CVSS v3 |
|---|---|---|---|---|---|
| CVE-2026-2455 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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 | |||||
| CVE-2026-2454 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-2325 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 4.3 MEDIUM |
| Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to limit the size of the request body on the start meeting API endpoint, which allows an authenticated attacker to cause resource exhaustion or denial of service via a crafted oversized HTTP POST request to {{/api/v1/meetings}}.. Mattermost Advisory ID: MMSA-2026-00608 | |||||
| CVE-2026-28759 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 4.3 MEDIUM |
| Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel, including private channels, via crafted membership sync messages targeting channels the remote cluster is not authorized to access. Mattermost Advisory ID: MMSA-2026-00576 | |||||
| CVE-2026-28741 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 6.8 MEDIUM |
| Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625 | |||||
| CVE-2026-28732 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 4.3 MEDIUM |
| Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597 | |||||
| CVE-2026-27769 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 2.7 LOW |
| Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603 | |||||
| CVE-2026-27659 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-27656 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-26304 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-26246 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-26233 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-26230 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-25783 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-25780 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-24692 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 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-2026-24661 | 1 Mattermost | 1 Mattermost | 2026-06-17 | N/A | 3.7 LOW |
| Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00611 | |||||
| CVE-2026-24458 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 7.5 HIGH |
| Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly handle very long passwords, which allows an attacker to overload the server CPU and memory via executing login attempts with multi-megabyte passwords. Mattermost Advisory ID: MMSA-2026-00587 | |||||
| CVE-2026-22892 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 4.3 MEDIUM |
| Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to validate user permissions when creating Jira issues from Mattermost posts, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to via the /create-issue API endpoint by providing the post ID of an inaccessible post.. Mattermost Advisory ID: MMSA-2025-00550 | |||||
| CVE-2026-22545 | 1 Mattermost | 1 Mattermost Server | 2026-06-17 | N/A | 3.1 LOW |
| Mattermost versions 10.11.x <= 10.11.10 fail to validate user's authentication method when processing account auth type switch which allows an authenticated attacker to change account password without confirmation via falsely claiming a different auth provider.. Mattermost Advisory ID: MMSA-2026-00583 | |||||