{"apiVersion":"1.0","identifier":"CVE-2026-54721","description":"Silverstripe UserForms provides a visual form builder for the Silverstripe CMS. From 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, the userform email recipient subject field in the CMS accepts a specially crafted payload that can be interpreted as executable server-side code. An authenticated CMS user with permission to configure a UserForms email recipient can use the subject field to run arbitrary code on the server, compromising confidentiality, integrity, and availability. This issue is fixed in versions 6.4.9, 7.0.7, and 7.1.1.","publishedAt":"2026-08-27T20:17:49","lastModifiedAt":"2026-08-27T20:17:49","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54721","cvssScore":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00415,"riskScore":0.91,"affectedProduct":"Silverstripe UserForms","affectedVersions":">=6.0.0,<6.4.9, >=7.0.0,<7.0.7, >=7.1.0,<7.1.1","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-54721","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-54721","en":"https://www.redsauce.net/en/cves/CVE-2026-54721","fr":"https://www.redsauce.net/fr/cves/CVE-2026-54721","pt":"https://www.redsauce.net/pt/cves/CVE-2026-54721","de":"https://www.redsauce.net/de/cves/CVE-2026-54721","sk":"https://www.redsauce.net/sk/cves/CVE-2026-54721","el":"https://www.redsauce.net/el/cves/CVE-2026-54721"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-54721"}}