Mattermost
by Mattermost
Source repositories
CVEs (566)
| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2026-6345 | Med | 0.35 | 6.5 | 0.00 | May 18, 2026 | Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614 | ||
| CVE-2026-5163 | Med | 0.35 | 6.5 | 0.00 | May 18, 2026 | Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to… | ||
| CVE-2026-3590 | Med | 0.35 | 6.5 | 0.00 | Apr 15, 2026 | 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 enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated… | ||
| CVE-2026-3114 | Med | 0.35 | 6.5 | 0.00 | Mar 26, 2026 | 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 validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip… | ||
| CVE-2025-12689 | Med | 0.35 | 6.5 | 0.00 | Dec 17, 2025 | 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. | ||
| CVE-2025-55070 | Med | 0.35 | 6.5 | 0.00 | Nov 14, 2025 | Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events | ||
| CVE-2025-9076 | Med | 0.35 | 6.5 | 0.00 | Sep 15, 2025 | Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects… | ||
| CVE-2025-6226 | Med | 0.35 | 6.5 | 0.00 | Jul 18, 2025 | Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the… | ||
| CVE-2025-41395 | Med | 0.35 | 6.5 | 0.00 | Apr 24, 2025 | Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to properly validate the props used by the RetrospectivePost custom post type in the Playbooks plugin, which allows an attacker to create a specially crafted post with maliciously crafted props and… | ||
| CVE-2025-35965 | Med | 0.35 | 6.5 | 0.00 | Apr 24, 2025 | Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions… | ||
| CVE-2025-27933 | Med | 0.35 | 5.4 | 0.00 | Mar 21, 2025 | Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public | ||
| CVE-2024-54682 | Med | 0.35 | 6.5 | 0.00 | Dec 16, 2024 | Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to limit the file size for slack import file uploads which allows a user to cause a DoS via zip bomb by importing data in a team they are a team admin. | ||
| CVE-2024-54083 | Med | 0.35 | 6.5 | 0.01 | Dec 16, 2024 | Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to properly validate the type of callProps which allows a user to cause a client side (webapp and mobile) DoS to users of particular channels, by sending a specially crafted post. | ||
| CVE-2024-42406 | Med | 0.35 | 5.4 | 0.00 | Sep 26, 2024 | Mattermost versions 9.11.x <= 9.11.0, 9.10.x <= 9.10.1, 9.9.x <= 9.9.2 and 9.5.x <= 9.5.8 fail to properly authorize requests when viewing archived channels is disabled, which allows an attacker to retrieve post and file information about archived channels. Examples are flagged… | ||
| CVE-2023-2000 | Med | 0.35 | 5.4 | 0.00 | May 2, 2023 | Mattermost Desktop App fails to validate a mattermost server redirection and navigates to an arbitrary website | ||
| CVE-2022-0903 | Med | 0.35 | 5.3 | 0.01 | Mar 10, 2022 | A call stack overflow bug in the SAML login feature in Mattermost server in versions up to and including 6.3.2 allows an attacker to crash the server via submitting a maliciously crafted POST body. | ||
| CVE-2017-18919 | Med | 0.35 | 5.3 | 0.01 | Jun 19, 2020 | An issue was discovered in Mattermost Server before 3.7.0 and 3.6.3. Attackers can use the API for unauthenticated team creation. | ||
| CVE-2017-18914 | Med | 0.35 | 5.3 | 0.01 | Jun 19, 2020 | 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. | ||
| CVE-2016-11078 | Med | 0.35 | 6.5 | 0.01 | Jun 19, 2020 | An issue was discovered in Mattermost Server before 3.0.0. It potentially allows attackers to obtain sensitive information (credential fields within config.json) via the System Console UI. | ||
| CVE-2016-11072 | Med | 0.35 | 6.5 | 0.01 | Jun 19, 2020 | An issue was discovered in Mattermost Server before 3.0.2. The purposes of a session ID and a Session Token were mishandled. |
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to…
- risk 0.35cvss 6.5epss 0.00
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 enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated…
- risk 0.35cvss 6.5epss 0.00
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 validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip…
- risk 0.35cvss 6.5epss 0.00
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.
- risk 0.35cvss 6.5epss 0.00
Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects…
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the…
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to properly validate the props used by the RetrospectivePost custom post type in the Playbooks plugin, which allows an attacker to create a specially crafted post with maliciously crafted props and…
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions…
- risk 0.35cvss 5.4epss 0.00
Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public
- risk 0.35cvss 6.5epss 0.00
Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to limit the file size for slack import file uploads which allows a user to cause a DoS via zip bomb by importing data in a team they are a team admin.
- risk 0.35cvss 6.5epss 0.01
Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to properly validate the type of callProps which allows a user to cause a client side (webapp and mobile) DoS to users of particular channels, by sending a specially crafted post.
- risk 0.35cvss 5.4epss 0.00
Mattermost versions 9.11.x <= 9.11.0, 9.10.x <= 9.10.1, 9.9.x <= 9.9.2 and 9.5.x <= 9.5.8 fail to properly authorize requests when viewing archived channels is disabled, which allows an attacker to retrieve post and file information about archived channels. Examples are flagged…
- risk 0.35cvss 5.4epss 0.00
Mattermost Desktop App fails to validate a mattermost server redirection and navigates to an arbitrary website
- risk 0.35cvss 5.3epss 0.01
A call stack overflow bug in the SAML login feature in Mattermost server in versions up to and including 6.3.2 allows an attacker to crash the server via submitting a maliciously crafted POST body.
- risk 0.35cvss 5.3epss 0.01
An issue was discovered in Mattermost Server before 3.7.0 and 3.6.3. Attackers can use the API for unauthenticated team creation.
- risk 0.35cvss 5.3epss 0.01
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.
- risk 0.35cvss 6.5epss 0.01
An issue was discovered in Mattermost Server before 3.0.0. It potentially allows attackers to obtain sensitive information (credential fields within config.json) via the System Console UI.
- risk 0.35cvss 6.5epss 0.01
An issue was discovered in Mattermost Server before 3.0.2. The purposes of a session ID and a Session Token were mishandled.
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