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Medium 5.3
Mattermost Server is vulnerable to Uncontrolled Resource Consumption
An issue was discovered in Mattermost Server before 3.2.0. It allowed crafted posts that could cause a web browser to hang.
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Medium 6.1
Mattermost Server vulnerable to Cross-site Scripting through file preview feature
An issue was discovered in Mattermost Server before 3.5.1. XSS can occur via file preview.
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Medium 4.9
Mattermost Server does not restrict SAML certificate path for System Administrators
An issue was discovered in Mattermost Server before 3.7.3 and 3.6.5. A System Administrator can place a SAML certificate at an arbitrary pathname.
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Medium 6.1
Mattermost Server vulnerable to XSS through channel headers
An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. XSS could occur via a channel header.
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Medium —
Mattermost Server has Improper Authorization for Integration Requests
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. API endpoint access control does not honor an integration permission restriction.
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Medium 5.3
Mattermost Server has Insufficient Session Expiration when used as an OAuth 2.0 service provider
An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when used as an OAuth 2.0 service provider, Session invalidation was mishandled.
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Medium 6.1
Mattermost Server vulnerable to XSS via an uploaded file
An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. It allows XSS via an uploaded file.
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Medium 5.3
Mattermost Server exposes team invite IDs through API endpoints
An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. It allows attackers to discover team invite IDs via team API endpoints.
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Medium 5.3
Mattermost Server is vulnerable to DoS through maliciously crafted posts
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows crafted posts that potentially cause a web browser to hang.
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Medium 5.3
Mattermost Server exposes sensitive user status information via REST API version 4 endpoint
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows attackers to obtain sensitive information (user statuses) via a REST API version 4 endpoint.
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Medium 5.3
Mattermost Server exposes team creator's e-mail address to other members
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It discloses the team creator's e-mail address to members.
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Medium 6.1
Mattermost Server is vulnerable to XSS through display name field
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. Display names allow XSS.
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Medium 5.3
Mattermost Server allows attackers to log sensitive information via DEBUG REST API logging endpoint
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows attackers to add DEBUG lines to the logs via a REST API version 3 logging endpoint.
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Medium 6.1
Mattermost Server mishandles redirect denial action
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5, when used as an OAuth 2.0 service provider. It mishandles a deny action for a redirection.
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Medium 5.3
Mattermost Server exposes private team invite ID
An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. It allows attackers to discover a team invite ID by requesting a JSON document.
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Medium 4.3
Mattermost Server is vulnerable to webhook and slash command manipulation
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. An attacker could create fictive system-message posts via webhooks and slash commands, in the v3 or v4 REST API.
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Medium 4.3
Mattermost Server allows attackers to create buttons that can launch API requests
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows an attacker to create a button that, when pressed by a user, launches an API request.
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Medium 6.1
Mattermost Server does not neutralize HTML content in an Email template field
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. E-mail templates can have a field in which HTML content is not neutralized.
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Medium 6.1
Mattermost Server does not safeguard against phishing via error page links
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows Phishing because an error page can have a link.
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Medium —
Mattermost Server has low entropy for authorization data as an OAuth 2.0 Service Provider
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2, when serving as an OAuth 2.0 Service Provider. There is low entropy for authorization data.
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Medium 6.1
Mattermost Server is vulnerable to XSS through author_link field in Slack attachments
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS could occur via the author_link field of a Slack attachment.
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Medium 4.3
Mattermost Server allows users with a session ID to revoke another users' session
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. Knowledge of a session ID allows revoking another user's session.
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Medium —
Mattermost Server is vulnerable to Directory Traversal by System Admins
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used. A System Admin can achieve directory traversal.
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Medium 5.3
Mattermost Server is vulnerable to channel invisibility DoS via misformatted post
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to cause a denial of service (channel invisibility) via a misformatted post.
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Medium 4.3
Mattermost Server's OAuth 2.0 service is vulnerable to attack through Missing Authorization
An issue was discovered in Mattermost Server before 4.4.3 and 4.3.3. Attackers could reconfigure an OAuth app in some cases where Mattermost is an OAuth 2.0 service provider.
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Medium —
Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS attacks could occur against an OAuth 2.0 allow/deny page.
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Medium —
Mattermost Server is vulnerable to Path Traversal when files are stored locally
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used. A System Admin can test for the existence of an arbitrary file.
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Medium —
Mattermost Server does not prevent System Admin from arbitrary file creation
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used. A System Admin can create arbitrary files.
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Medium 5.3
Mattermost Server Sensitive Data Exposure
An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the update_team WebSocket event, aka MMSA-2020-0012.