CVE-2026-26233

CVE-2026-26233 affects Mattermost releases 10.11.x to 11.4.x, where login requests are not rate-limited, enabling unauthenticated remote attackers to cause denial of service via an HTTP/2 single-packet attack with 100+ parallel login requests. No patch/version details are provided in the document...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Vulnerabilities exist in versions of Mattermost 11.4.0 and earlier 11.4.x series, as well as versions prior to 11.3.1 11.3.x series, 11.2.3 and earlier 11.2.x series, and 10.11.11 and earlier 10.11.x...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Vulnerabilities exist in versions of Mattermost 11.4.0 and earlier 11.4.x series, as well as versions prior to 11.3.1 11.3.x series, 11.2.3 and earlier 11.2.x series, and 10.11.11 and earlier 10.11.x...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Vulnerabilities exist in Mattermost versions 11.2.2 and earlier of the 11.2.x series, as well as versions 10.11.10 and earlier of the 10.11.x series, 11.4.0 and earlier of the 11.4.x series, and 11.3...

PT-2026-27810

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.4.0 and earlier Mattermost versions 11.3.1 and earlier Mattermost versions 11.2.3 and earlier Mattermost versions 10.11.11 and earlier Description The software does not properly prevent the rendering of external Scalable...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Vulnerabilities exist in Mattermost versions 11.4.0 and earlier 11.4.x series, 11.3.1 and earlier 11.3.x series, 11.2.3 and earlier 11.2.x series, as well as 10.11.11 and earlier 10.11.x series. Thes...

PT-2026-27990

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.2.x through 11.2.2 Mattermost versions 10.11.x through 10.11.10 Mattermost versions 11.4.x through 11.4.0 Mattermost versions 11.3.x through 11.3.1 Description The software does not properly validate Cross-Site Request...

PT-2026-27961

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.4.0 and earlier Mattermost versions 11.3.1 and earlier Mattermost versions 11.2.3 and earlier Mattermost versions 10.11.11 and earlier Description The software does not adequately limit the rate of login requests. This...

PT-2026-27989

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.4.0 and earlier, 11.3.1 and earlier, 11.2.3 and earlier, 10.11.11 and earlier Description The software does not properly validate user identity within the OpenID IsSameUser comparison logic. This flaw, stemming from over...

Malicious code in mattermost-data-warehouse (PyPI)

--- -= Per source details. Do not edit below this line.=- Source: kam193 50f2483a1650869326d4fddf7bf66bc1dc6e6d614300cf8b41577595ded48165 Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose. --- Category: PROBABLYPENTES...

MAL-2026-2148 Malicious code in mattermost-data-warehouse (PyPI)

--- -= Per source details. Do not edit below this line.=- Source: kam193 50f2483a1650869326d4fddf7bf66bc1dc6e6d614300cf8b41577595ded48165 Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose. --- Category: PROBABLYPENTES...

Open Redirect

github.com/mattermost/mattermost is vulnerable to an open redirect. The vulnerability is due to improper validation of redirect URLs on the /error page, which allows an attacker to craft a malicious link that redirects victims to a malicious site when opened in a new tab...

GO-2026-4812 Mattermost fails to verify run_create permission for empty playbookId in github.com/mattermost/mattermost-plugin-playbooks

Mattermost fails to verify runcreate permission for empty playbookId in github.com/mattermost/mattermost-plugin-playbooks...

GO-2026-4786 Mattermost fails to validate user's authentication method when processing account auth type switch in github.com/mattermost/mattermost-server

Mattermost fails to validate user's authentication method when processing account auth type switch 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...

GO-2026-4784 Mattermost Microsoft Teams Plugin fails to properly mask sensitive configuration values in github.com/mattermost/mattermost-plugin-msteams

Mattermost Microsoft Teams Plugin fails to properly mask sensitive configuration values in github.com/mattermost/mattermost-plugin-msteams...

GO-2026-4782 Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications in github.com/mattermost/mattermost-plugin-boards

Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications in github.com/mattermost/mattermost-plugin-boards...

GO-2026-4727 Mattermost fails to bound memory allocation when processing PSD image files in github.com/mattermost/mattermost-server

Mattermost fails to bound memory allocation when processing PSD image files 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...

GO-2026-4729 Mattermost allows a removed team member to enumerate all public channels within a private team in github.com/mattermost/mattermost-server

Mattermost allows a removed team member to enumerate all public channels within a private team 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 causi...

GO-2026-4735 Mattermost fails to filter invite IDs based on user permissions in github.com/mattermost/mattermost-server

Mattermost fails to filter invite IDs based on user permissions 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...

GO-2026-4744 Mattermost fails to use consistent error responses when handling the /mute command in github.com/mattermost/mattermost-server

Mattermost fails to use consistent error responses when handling the /mute command 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...