{"action":"Upgrade craftcms/cms to 4.17.16 or later.","affected":[{"fixed":"5.9.23","introduced":"5.0.0-RC1"},{"fixed":"4.17.16","introduced":"4.0.0-RC1"}],"component":"craftcms/cms","cve_ids":["CVE-2026-55790"],"ecosystem":"Packagist","epss":0.00461,"exploited":false,"fixed_versions":["5.9.23","4.17.16"],"ghsa_id":"GHSA-24x4-j6x9-rfw5","id":"tcs_01M5KERH6G5A6NMPCC6082VB1N","modified_at":"2026-09-10T03:51:09.883952357Z","published_at":"2026-07-06T21:29:16Z","references":["https://osv.dev/vulnerability/GHSA-24x4-j6x9-rfw5","https://github.com/craftcms/cms/security/advisories/GHSA-24x4-j6x9-rfw5","https://nvd.nist.gov/vuln/detail/CVE-2026-55790","https://github.com/craftcms/cms/commit/6bbb66038a268552180ca5c8eed9f46ea25a4417","https://github.com/craftcms/cms"],"severity":{"label":"high"},"sources":[{"source":"osv","source_id":"GHSA-24x4-j6x9-rfw5","url":"https://osv.dev/vulnerability/GHSA-24x4-j6x9-rfw5"}],"summary":"Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget"}