{"action":"Upgrade phpoffice/phpspreadsheet to 1.30.4 or later.","affected":[{"fixed":"5.7.0","introduced":"4.0.0"},{"fixed":"3.10.5","introduced":"3.3.0"},{"fixed":"2.4.5","introduced":"2.2.0"},{"fixed":"2.1.16","introduced":"2.0.0"},{"fixed":"1.30.4","introduced":"0"}],"component":"phpoffice/phpspreadsheet","cve_ids":["CVE-2026-35453"],"ecosystem":"Packagist","epss":0.00239,"exploited":false,"fixed_versions":["5.7.0","3.10.5","2.4.5","2.1.16","1.30.4"],"ghsa_id":"GHSA-6wpp-88cp-7q68","id":"tcs_01M5KEXFDBABCETS3YJYTA2V1M","modified_at":"2026-05-08T15:50:49.240394Z","published_at":"2026-04-28T22:50:31Z","references":["https://osv.dev/vulnerability/GHSA-6wpp-88cp-7q68","https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-6wpp-88cp-7q68","https://nvd.nist.gov/vuln/detail/CVE-2026-35453","https://github.com/PHPOffice/PhpSpreadsheet"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-6wpp-88cp-7q68","url":"https://osv.dev/vulnerability/GHSA-6wpp-88cp-7q68"}],"summary":"PhpSpreadsheet has XSS via NumberFormat @ Text Substitution in HTML Writer"}