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
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-29977.json"