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Vulnerabilities

Mattermost Mattermost Server

Ranked by severity, then by exploit likelihood, unless you sort otherwise. Click a CVE ID for its full record.

506CVEs
CVE-2023-6547
Playbooks access/modification by removed team member
Published 2023-12-12 · Modified
5.4EPSS 0.003
CVE-2025-41410
Slack import bypasses email verification for team access controls
Published 2025-10-16 · Analyzed
5.4EPSS 0.003
CVE-2026-10085
Ordinary group/direct message member can enable group_constrained and remove all channel participants
Published 2026-07-13 · Analyzed
5.4EPSS 0.003
CVE-2026-16044
Insufficient validation of guest board admin privileges on archive import
Published 2026-08-17 · Analyzed
5.4EPSS 0.003
CVE-2026-5139
GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration
Published 2026-06-22 · Analyzed
5.4EPSS 0.003
CVE-2024-39837
Malicious remote can create arbitrary channels
Published 2024-08-01 · Analyzed
5.4EPSS 0.003
CVE-2023-3586
Disabling publicly-shared boards does not disable existing publicly available board links
Published 2023-07-17 · Modified
5.4EPSS 0.003
CVE-2025-2475
Unauthorized Bot Login Using Credentials
Published 2025-04-14 · Analyzed
5.4EPSS 0.002
CVE-2026-9597
Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint
Published 2026-07-13 · Analyzed
5.4EPSS 0.002
CVE-2025-3230
Bypass of System Admin User Deactivation Controls for Personal Access Tokens in Mattermost Server
Published 2025-05-30 · Analyzed
5.4EPSS 0.002
CVE-2024-42406
Unauthorized access on archived channels
Published 2024-09-26 · Analyzed
5.4EPSS 0.002
CVE-2025-46702
Mattermost Playbooks allows privilege escalation through improper access control in playbook run participant management
Published 2025-06-30 · Analyzed
5.4EPSS 0.002
CVE-2024-45843
Weak SSRF Filtering
Published 2024-09-26 · Analyzed
5.4EPSS 0.002
CVE-2025-27933
Unauthorized Private-to-Public Channel Conversion
Published 2025-03-21 · Analyzed
5.4EPSS 0.002
CVE-2025-47871
Mattermost Playbooks exposes private channel metadata to unauthorized users via run metadata API
Published 2025-06-30 · Analyzed
5.4EPSS 0.002
CVE-2026-0999
Authentication bypass via userID login when email and username login are disabled
Published 2026-02-16 · Analyzed
5.4EPSS 0.002
CVE-2025-55073
MS Teams plugin OAuth allows editing arbitrary posts
Published 2025-11-14 · Analyzed
5.4EPSS 0.002
CVE-2026-4274
Insufficient authorization in shared channel membership sync grants team-level access instead of channel-level access
Published 2026-03-26 · Analyzed
5.4EPSS 0.001
CVE-2026-28735
GitHub OAuth Scope Validation
Published 2026-05-22 · Analyzed
5.4EPSS 0.001
CVE-2020-14452
An issue was discovered in Mattermost Server before 5.21.0. mmctl allows directory traversal via HTTP, aka MMSA-2020-0014.
Published 2020-06-19 · Modified
5.3EPSS 0.013
CVE-2016-11067
An issue was discovered in Mattermost Server before 3.2.0. It allowed crafted posts that could cause a web browser to hang.
Published 2020-06-19 · Modified
5.3EPSS 0.011
CVE-2017-18873
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.
Published 2020-06-19 · Modified
5.3EPSS 0.011
CVE-2017-18898
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.
Published 2020-06-19 · Modified
5.3EPSS 0.011
CVE-2017-18899
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It mishandles IP-based rate limiting.
Published 2020-06-19 · Modified
5.3EPSS 0.011
CVE-2018-21259
An issue was discovered in Mattermost Server before 4.10.1, 4.9.4, and 4.8.2. It allows attackers to cause a denial of service (application hang) via a malformed link in a channel.
Published 2020-06-19 · Modified
5.3EPSS 0.011
CVE-2016-11068
An issue was discovered in Mattermost Server before 3.2.0. Attackers could read LDAP fields via injection.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2016-11075
An issue was discovered in Mattermost Server before 3.0.0. It allows attackers to obtain sensitive information about team URLs via an API.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2017-18887
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.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2017-18895
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.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2017-18901
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.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2017-18902
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.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2019-20866
An issue was discovered in Mattermost Server before 5.12.0. Use of a Proxy HTTP header, rather than the source address in an IP packet header, for obtaining IP address information was mishandled.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2019-20877
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. It allows attackers to obtain sensitive information about whether someone has 2FA enabled.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2020-14457
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.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2016-11076
An issue was discovered in Mattermost Server before 3.0.0. It does not ensure that a cookie is used over SSL.
Published 2020-06-19 · Modified
5.3EPSS 0.009
CVE-2016-11062
An issue was discovered in Mattermost Server before 3.5.1. E-mail address verification can be bypassed.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2018-21257
An issue was discovered in Mattermost Server before 5.1. It allows attackers to bypass intended access restrictions (for setting a channel header) via the Channel header slash command API.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2017-18914
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. An external link can occur on an error page even if it is not on an allowlist.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2019-20847
An issue was discovered in Mattermost Server before 5.18.0. An attacker can send a user_typing WebSocket event to any channel.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2019-20867
An issue was discovered in Mattermost Server before 5.11.0. An attacker can interfere with a channel's post loading via one crafted post.
Published 2020-06-19 · Modified
5.3EPSS 0.008
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