Mattermost Playbooks fails to properly validate the props used by the RetrospectivePost custom post type

Open Source Vulnerabilities GHSA-3g36-gf7c-75qw

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 cause a denial of service (DoS) of the web app for all users.

Open Source Vulnerabilities GO-2025-3642

Mattermost Playbooks fails to properly validate the props used by the RetrospectivePost custom post type in github.com/mattermost/mattermost-plugin-playbooks. 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 vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: .

Open Source Vulnerabilities CVE-2025-41395

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 cause a denial of service (DoS) of the web app for all users.