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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-2019-20869
An issue was discovered in Mattermost Server before 5.10.0, 5.9.1, 5.8.2, and 4.10.9. A non-member could change the Update/Patch Channel endpoint for a private channel.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2019-20884
An issue was discovered in Mattermost Server before 5.8.0. It allows attackers to partially attach a file to more than one post.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2017-18896
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.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2017-18905
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.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2017-18916
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.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2017-18919
An issue was discovered in Mattermost Server before 3.7.0 and 3.6.3. Attackers can use the API for unauthenticated team creation.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2019-20875
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. It allows a password reset to proceed while an e-mail address is being changed.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2019-20882
An issue was discovered in Mattermost Server before 5.8.0. It does not honor the domain requirement when processing a join request for an open team.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2019-20889
An issue was discovered in Mattermost Server before 5.7, 5.6.3, 5.5.2, and 4.10.5. It mishandles permissions for user-access token creation.
Published 2020-06-19 · Modified
5.3EPSS 0.008
CVE-2023-6459
Public endpoint /metrics of Calls plugin reveals channel IDs
Published 2023-12-06 · Modified
5.3EPSS 0.005
CVE-2026-10556
Unauthenticated webhook request with null notification entry could crash the Microsoft Calendar plugin.
Published 2026-09-14 · Analyzed
5.3EPSS 0.004
CVE-2023-5331
File Information Leak via IDOR in file_id in Draft Posts
Published 2023-10-09 · Modified
5.3EPSS 0.004
CVE-2025-3913
Team Privacy Settings Authorization Bypass in Mattermost Server
Published 2025-05-29 · Analyzed
5.3EPSS 0.003
CVE-2025-22445
Misleading UI for undefined admin console settings in Calls causes security confusion
Published 2025-01-09 · Analyzed
5.3EPSS 0.003
CVE-2025-0503
Leaked User IDs and Metadata of Deleted DMs
Published 2025-02-14 · Analyzed
5.3EPSS 0.003
CVE-2026-6046
Plugin bot username conflict allows user account to be used as bot identity in Mattermost Server
Published 2026-06-12 · Analyzed
5.3EPSS 0.002
CVE-2026-18223
Mattermost invitation tokens not bound to invited email address allowing unauthorized team and private channel access
Published 2026-10-16 · Analyzed
5.0EPSS 0.002
CVE-2026-6333
SSRF via Host Header Spoofing in Custom Slash Commands
Published 2026-05-18 · Analyzed
5.0EPSS 0.001
CVE-2026-10542
Playbooks channel action update validation issue
Published 2026-09-14 · Analyzed
5.0EPSS 0.001
CVE-2017-18876
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.
Published 2020-06-19 · Modified
4.9EPSS 0.009
CVE-2017-18875
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.
Published 2020-06-19 · Modified
4.9EPSS 0.007
CVE-2017-18918
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.
Published 2020-06-19 · Modified
4.9EPSS 0.005
CVE-2026-9708
Incoming webhook user attribution via unvalidated webhook owner
Published 2026-07-13 · Analyzed
4.9EPSS 0.004
CVE-2026-3116
Improper Input Validation in Zoom Plugin Webhook Handler
Published 2026-03-26 · Analyzed
4.9EPSS 0.004
CVE-2025-8402
Nil pointer dereference in bulk import crashes server
Published 2025-08-21 · Analyzed
4.9EPSS 0.003
CVE-2025-11794
Password hash and MFA secret returned in user email verification endpoint
Published 2025-11-14 · Analyzed
4.9EPSS 0.003
CVE-2025-32093
Syatem admin profile modification by delegated granular administration role
Published 2025-04-14 · Analyzed
4.9EPSS 0.003
CVE-2026-19600
Mattermost logs plaintext authentication tokens in debug-level server logs on failed auth attempts
Published 2026-10-16 · Analyzed
4.9EPSS 0.002
CVE-2026-19601
Disclosure of AD/LDAP bind password via Test Connection
Published 2026-10-16 · Analyzed
4.9EPSS 0.002
CVE-2026-19076
Mattermost fails to reject OAuth application sessions in account type switch, allowing account takeover via bearer token
Published 2026-10-16 · Analyzed
4.9EPSS 0.002
CVE-2024-48872
Bypass of "Max failed attempts" restriction via race condition
Published 2024-12-16 · Analyzed
4.8EPSS 0.003
CVE-2024-36250
MFA Code Replay
Published 2024-11-09 · Analyzed
4.8EPSS 0.002
CVE-2026-3495
Unescaped variables during error page composition
Published 2026-05-18 · Analyzed
4.8EPSS 0.001
CVE-2024-29221
Invite ID available to team admins even without the "Add Members" permission
Published 2024-04-05 · Analyzed
4.7EPSS 0.003
CVE-2024-12247
Improper propagation of permission scheme updates across cluster nodes
Published 2024-12-05 · Analyzed
4.6EPSS 0.002
CVE-2024-46872
Client-Side Path Traversal Leading to CSRF in Playbooks
Published 2024-10-29 · Analyzed
4.6EPSS 0.002
CVE-2026-27659
CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint
Published 2026-03-25 · Analyzed
4.6EPSS 0.001
CVE-2017-18878
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.
Published 2020-06-19 · Modified
4.3EPSS 0.008
CVE-2017-18890
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.
Published 2020-06-19 · Modified
4.3EPSS 0.008
CVE-2019-20890
An issue was discovered in Mattermost Server before 5.7. It allows a bypass of e-mail address discovery restrictions.
Published 2020-06-19 · Modified
4.3EPSS 0.008
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