{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260310115442-5a1ea95044d or later.","affected":[{"fixed":"10.11.14","introduced":"10.11.0"},{"fixed":"11.5.2","introduced":"11.5.0"},{"fixed":"8.0.0-20260310115442-5a1ea95044d","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-3495"],"ecosystem":"Go","epss":0.00143,"exploited":false,"fixed_versions":["10.11.14","11.5.2","8.0.0-20260310115442-5a1ea95044d"],"ghsa_id":"GHSA-jx93-pf6x-874r","id":"tcs_01M5KFEXCDEGZRVFRAXPDHSGNV","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","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"}