Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly validate synced reactions, when shared channels are enabled, which allows a malicious remote to create arbitrary reactions on arbitrary posts
{ "nvd_published_at": "2024-08-01T15:15:11Z", "cwe_ids": [ "CWE-284" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2024-08-02T13:30:23Z" }