{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260123211116-9efe617be8b8 or later.","affected":[{"fixed":"8.0.0-20260123211116-9efe617be8b8","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-2457"],"ecosystem":"Go","epss":0.00109,"exploited":false,"fixed_versions":["8.0.0-20260123211116-9efe617be8b8"],"ghsa_id":"GHSA-ph22-fw5m-w2q9","id":"tcs_01M5KFHCVA8SDR5TCWT4MH0762","modified_at":"2026-03-23T18:56:18.286997Z","published_at":"2026-03-16T15:30:42Z","references":["https://osv.dev/vulnerability/GHSA-ph22-fw5m-w2q9","https://nvd.nist.gov/vuln/detail/CVE-2026-2457","https://github.com/mattermost/mattermost/commit/9efe617be8b8f1d036e12721e8e73b69a543ed34","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-ph22-fw5m-w2q9","url":"https://osv.dev/vulnerability/GHSA-ph22-fw5m-w2q9"}],"summary":"Mattermost allows attackers to spoof permalink embeds"}