{"action":"Upgrade craftcms/cms to 4.16.19 or later.","affected":[{"fixed":"5.8.23","introduced":"5.0.0-RC1"},{"fixed":"4.16.19","introduced":"3.5.0"}],"component":"craftcms/cms","cve_ids":["CVE-2026-27129"],"ecosystem":"Packagist","epss":0.00464,"exploited":false,"fixed_versions":["5.8.23","4.16.19"],"ghsa_id":"GHSA-v2gc-rm6g-wrw9","id":"tcs_01M5KF8PQHNW01Z1F5DAB6XK8E","modified_at":"2026-02-24T20:59:13.352088Z","published_at":"2026-02-24T15:51:07Z","references":["https://osv.dev/vulnerability/GHSA-v2gc-rm6g-wrw9","https://github.com/craftcms/cms/security/advisories/GHSA-v2gc-rm6g-wrw9","https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc","https://nvd.nist.gov/vuln/detail/CVE-2026-27129","https://github.com/craftcms/cms/commit/2825388b4f32fb1c9bd709027a1a1fd192d709a3","https://github.com/craftcms/cms"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GHSA-v2gc-rm6g-wrw9","url":"https://osv.dev/vulnerability/GHSA-v2gc-rm6g-wrw9"},{"source":"nvd","source_id":"CVE-2026-27129","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27129"}],"summary":"Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution"}