{"action":"Upgrade github.com/mattermost/mattermost-server to 9.11.6+incompatible or later.","affected":[{"fixed":"9.11.6+incompatible","introduced":"9.11.0+incompatible"},{"fixed":"10.0.4+incompatible","introduced":"10.0.0+incompatible"},{"fixed":"10.1.4+incompatible","introduced":"10.1.0+incompatible"},{"fixed":"10.2.1+incompatible","introduced":"10.2.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-20621"],"ecosystem":"Go","epss":0.00478,"exploited":false,"fixed_versions":["9.11.6+incompatible","10.0.4+incompatible","10.1.4+incompatible","10.2.1+incompatible"],"ghsa_id":"GHSA-w6xh-c82w-h997","id":"tcs_01M5KG6SMC4BEC84MMNWZ0TZQX","modified_at":"2026-02-04T02:47:10.000803Z","published_at":"2025-01-17T21:48:34Z","references":["https://osv.dev/vulnerability/GO-2025-3407","https://github.com/advisories/GHSA-w6xh-c82w-h997","https://nvd.nist.gov/vuln/detail/CVE-2025-20621","https://mattermost.com/security-updates"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GO-2025-3407","url":"https://osv.dev/vulnerability/GO-2025-3407"},{"source":"nvd","source_id":"CVE-2025-20621","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-20621"}],"summary":"Mattermost webapp crash via a crafted post in github.com/mattermost/mattermost-server"}