{"action":"Upgrade october/system to 3.7.14 or later.","affected":[{"fixed":"3.7.14","introduced":"0"},{"fixed":"4.1.10","introduced":"4.0.0"}],"component":"october/system","cve_ids":["CVE-2026-26067"],"ecosystem":"Packagist","epss":0.00417,"exploited":false,"fixed_versions":["3.7.14","4.1.10"],"ghsa_id":"GHSA-3888-q23f-x7qh","id":"tcs_01M5KESRWCF6BHTPPMRJTMGDBX","modified_at":"2026-05-05T15:59:59.427971Z","published_at":"2026-04-21T16:43:49Z","references":["https://osv.dev/vulnerability/GHSA-3888-q23f-x7qh","https://github.com/octobercms/october/security/advisories/GHSA-3888-q23f-x7qh","https://nvd.nist.gov/vuln/detail/CVE-2026-26067","https://github.com/octobercms/october"],"severity":{"label":"medium","score":4.9},"sources":[{"source":"osv","source_id":"GHSA-3888-q23f-x7qh","url":"https://osv.dev/vulnerability/GHSA-3888-q23f-x7qh"}],"summary":"October CMS has Safe Mode Bypass via CSS Preprocessor Compilers"}