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CVE-2025-12421

Account Takeover via Code Exchange Endpoint

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).

CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-13821

User profile update exposes password hash and MFA secrets

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-14350

Information disclosure via channel mentions in posts

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-14573

Team Admin Bypass of Invite Permissions via allow_open_invite Field

Mattermost versions 10.11.x <= 10.11.9 fail to enforce invite permissions when updating team settings, which allows team administrators without proper permissions to bypass restrictions and add users to their team via API requests. Mattermost Advisory ID: MMSA-2025-00561

CVSS 3.1 · 3.8 Low EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-14822

DoS from quadratic complexity in model.ParseHashtags

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-14435

Application-Level DoS via infinite re-render loop in user profile handling

Mattermost versions 10.11.x <= 10.11.8, 11.1.x <= 11.1.1, 11.0.x <= 11.0.6 fail to prevent infinite re-renders on API errors which allows authenticated users to cause application-level DoS via triggering unbounded component re-render loops.

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-27936

Webhook Secret Exposure via Timing attack in MSteams plugin

Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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Mattermost
Products
Mattermost Server Ms Teams
CVE-2025-13767

Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, 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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-64641

Mattermost Jira plugin crafted action leaks Jira issue details

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

CVSS 3.1 · 4.1 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-62190

CSRF Allows Call Initiation and Message Delivery

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 and Mattermost Calls versions <=1.10.0 fail to implement CSRF protection on the Calls widget page which allows an authenticated attacker to initiate calls and inject messages into channels or direct messages via a malicious webpage or crafted link

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-14273

Mattermost Jira plugin user spoofing enables Jira request forgery.

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enabled and Mattermost Jira plugin versions <=4.4.0 fail to enforce authentication and issue-key path restrictions in the Jira plugin, which allows an unauthenticated attacker who knows a valid user ID to issue authenticated GET and POST requests to the Jira server via crafted plugin payloads that spoof the user ID and inject arbitrary issue key paths. Mattermost Advisory ID: MMSA-2025-00555

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-13324

Lack of Invalidation of Legacy Remote Cluster Invite Tokens After Confirmation

Mattermost versions 10.11.x <= 10.11.5, 11.0.x <= 11.0.4, 10.12.x <= 10.12.2 fail to invalidate remote cluster invite tokens when using the legacy (version 1) protocol or when the confirming party does not provide a refreshed token, which allows an attacker who has obtained an invite token to authenticate as the remote cluster and perform limited actions on shared channels even after the invitation has been legitimately confirmed.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-12689

DoS in Calls plugin via malformed UTF-8 in WebSocket request

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-12756

Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion

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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Boards Mattermost Server
CVE-2025-13870

Unauthorized access and subscription vulnerability in Boards

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
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Mattermost
Products
Mattermost Mattermost Server
CVE-2025-12559

Information Disclosure in Common Teams API

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 sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-11794

Password hash and MFA secret returned in user email verification endpoint

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to sanitize user data which allows system administrators to access password hashes and MFA secrets via the POST /api/v4/users/{user_id}/email/verify/member endpoint

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Mattermost Mattermost Server
CVE-2025-55074

Channel member objects leak read status

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

CVSS 3.1 · 3 Low EPSS < 1% KEV · Not listed
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Mattermost
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Mattermost Mattermost Server
CVE-2025-55073

MS Teams plugin OAuth allows editing arbitrary posts

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
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Mattermost
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Mattermost Mattermost Server
CVE-2025-11777

Cross-team channel membership access

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Mattermost Mattermost Server