CVE-2026-4274

Mattermost CVE-2026-4274 affects multiple release lines: 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, and 11.3.x

CVE-2026-4274: Incorrect Authorization

Mattermost versions 11.2.x = 11.2.2, 10.11.x = 10.11.10, 11.4.x = 11.4.0, 11.3.x = 11.3.1 fail to restrict team-level access when processing membership sync from a remote cluster, which allows a malicious remote cluster to grant a user access to an entire private team instead of only the shared...

PT-2026-28642

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.10 Mattermost versions 11.2.0 through 11.2.2 Mattermost versions 11.3.0 through 11.3.1 Mattermost versions 11.4.0 Description The software does not properly restrict team-level access when processing...

CVE-2019-11497

In Couchbase Server 5.0.0, when an invalid Remote Cluster Certificate was entered as part of the reference creation, XDCR did not parse and check the certificate signature. It then accepted the invalid certificate and attempted to use it to establish future connections to the remote cluster. This...

SUSE CVE-2025-13324

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...

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...

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...

CVE-2025-13324: Incorrect Authorization

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...

EUVD-2019-3170

Malware in sbrugna...

EUVD-2021-24321

Malware in sbrugna...

EUVD-2025-25418

Malicious code in bioql PyPI...

EUVD-2024-38258

Malicious code in bioql PyPI...

EUVD-2024-0995

Malicious code in bioql PyPI...

CVE-2025-9076: Missing Authorization

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 Mattermost Server instanc...

Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.8.x < 10.8.4 / 10.9.x < 10.9.3 / 10.10.x < 10.10.1 / 10.11.0 Unrestricted Upload of File (MMSA-2025-00505)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00505 advisory. - Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2, 10.10.x = 10.10.0 fail to validate upload types in remote cluster...

GO-2025-3904 Mattermost Fails to Validate Remote Cluster Upload Sessions in github.com/mattermost/mattermost-server

Mattermost Fails to Validate Remote Cluster Upload Sessions in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. If this is causing false-positive reports from...

CVE-2025-49222

Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2, 10.10.x = 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in...

Mattermost Fails to Validate Remote Cluster Upload Sessions

Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2, 10.10.x = 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in...

GHSA-Q453-638C-H4MR Mattermost Fails to Validate Remote Cluster Upload Sessions

Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2, 10.10.x = 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in...

CVE-2025-49222

Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2, 10.10.x = 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in...