Mattermost Open Redirect vulnerability in github.com/mattermost/mattermost-server

Open Source Vulnerabilities CVE-2025-9084

Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs

Open Source Vulnerabilities GO-2025-3960

Mattermost Open Redirect vulnerability 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 vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/mattermost/mattermost/server/v8 before v8.0.0-202508080704-39bd251fe4f600.

Open Source Vulnerabilities GHSA-hm95-jx66-g2gh

Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs.