{"action":"Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20260310115442-5a1ea95044dc or later.","affected":[{"fixed":"5.3.2-0.20260310115442-5a1ea95044dc","introduced":"0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-3495"],"ecosystem":"Go","epss":0.00143,"exploited":false,"fixed_versions":["5.3.2-0.20260310115442-5a1ea95044dc"],"ghsa_id":"GHSA-jx93-pf6x-874r","id":"tcs_01M5KFEXHQMBFM960C3HWRZE5H","modified_at":"2026-06-25T23:11:43.451423152Z","published_at":"2026-05-18T09:31:47Z","references":["https://osv.dev/vulnerability/GHSA-jx93-pf6x-874r","https://nvd.nist.gov/vuln/detail/CVE-2026-3495","https://github.com/mattermost/mattermost/commit/5a1ea95044dc2d1ca601bfe9a4c1bc17990f3872","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"low","score":3.8},"sources":[{"source":"osv","source_id":"GHSA-jx93-pf6x-874r#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-jx93-pf6x-874r"}],"summary":"Mattermost doesn't escape some variables that could contain malicious content during error page composition"}