{"id":"CVE-2024-29977","details":"Mattermost versions 9.9.x \u003c= 9.9.0, 9.5.x \u003c= 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","aliases":["GHSA-jq3g-xqpx-37x3","GO-2024-3030"],"modified":"2025-11-15T18:52:44.481326Z","published":"2024-08-01T15:15:11.290Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-server","events":[{"introduced":"99d819d25d0b16b3faed901b1fe5c41de7655e9c"},{"fixed":"55b24d27c857936c742992b6e3ca94bb2c5c3dac"}]}],"versions":["@mattermost/client@9.5.0","@mattermost/types@9.5.0","v9.5.0","v9.5.0-rc3","v9.5.1","v9.5.1-rc1","v9.5.2","v9.5.3","v9.5.3-rc1","v9.5.3-rc2","v9.5.3-rc3","v9.5.4","v9.5.4-rc1","v9.5.4-rc2","v9.5.5","v9.5.5-rc1","v9.5.6","v9.5.6-rc1","v9.5.6-rc2","v9.5.7-rc1","v9.5.7-rc2"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-29977.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}