{"action":"Upgrade getkirby/cms to 4.9.0 or later.","affected":[{"fixed":"4.9.0","introduced":"0"},{"fixed":"5.4.0","introduced":"5.0.0"}],"component":"getkirby/cms","cve_ids":["CVE-2026-34587"],"ecosystem":"Packagist","epss":0.00477,"exploited":false,"fixed_versions":["4.9.0","5.4.0"],"ghsa_id":"GHSA-jcjw-58rv-c452","id":"tcs_01M5KF4FT85EMWJDZKVKC8T5HT","modified_at":"2026-05-05T16:14:51.812555Z","published_at":"2026-04-23T21:24:00Z","references":["https://osv.dev/vulnerability/GHSA-jcjw-58rv-c452","https://github.com/getkirby/kirby/security/advisories/GHSA-jcjw-58rv-c452","https://nvd.nist.gov/vuln/detail/CVE-2026-34587","https://github.com/getkirby/kirby","https://github.com/getkirby/kirby/releases/tag/4.9.0","https://github.com/getkirby/kirby/releases/tag/5.4.0"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GHSA-jcjw-58rv-c452","url":"https://osv.dev/vulnerability/GHSA-jcjw-58rv-c452"}],"summary":"Kirby has Server-Side Template Injection (SSTI) via double template resolution in option rendering"}