{"id":"CVE-2026-54721","summary":"Silverstripe UserForms: Remote code execution via userforms email subject","details":"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.","aliases":["GHSA-g8wr-r2v2-vqc6"],"modified":"2026-08-30T03:30:51.716664541Z","published":"2026-08-27T16:52:46.023Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54721.json"},"references":[{"type":"WEB","url":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9"},{"type":"WEB","url":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7"},{"type":"WEB","url":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54721.json"},{"type":"ADVISORY","url":"https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54721"},{"type":"FIX","url":"https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702"},{"type":"FIX","url":"https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c"},{"type":"FIX","url":"https://github.com/silverstripe/silverstripe-userforms/pull/1441"},{"type":"FIX","url":"https://github.com/silverstripe/silverstripe-userforms/pull/1442"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/silverstripe/silverstripe-userforms","events":[{"introduced":"0"},{"introduced":"982819c09734e2d58a931cab1e9d869012ddc016"},{"introduced":"4418856b97c398bfe54b4f4f93e100cc7997d06b"},{"fixed":"c55494ad7c717b199a3c1663b43a54db5d95604c"},{"fixed":"23c069866900c19b499bfa997d1e251e97491702"},{"fixed":"c371b6953d2b2ee8fdf2a3a771701c583b9b8333"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.4.9"},{"introduced":"7.0.0"},{"fixed":"7.0.7"},{"introduced":"7.1.0"},{"fixed":"7.1.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["7.1.0-rc1","7.1.0","6.4.8","7.0.6","7.0.5","7.0.4","6.4.7","7.0.3","6.4.6","7.0.2","6.4.5","7.0.1","6.4.4","6.4.3","7.0.0","6.4.2","6.4.1","6.4.0","6.4.0-rc1","6.4.0-beta1","6.3.0-rc1","6.3.0-beta1","6.2.0-rc1","6.2.0-beta1","6.1.0-beta1","6.0.0-beta1","5.12.0","5.11.0","5.9.2","5.10.0-alpha1","5.9.1","5.9.0-beta1","5.7.0","5.1.0","5.0.0-beta2","5.0.0-beta1","4.1.0","4.0.1","4.0.0","3.1.1","3.1.0","3.0.2","3.0.1","3.0.0","3.0.0-beta1","2.0.10","2.0.9","2.0.8","2.0.7","2.0.6","2.0.5","2.0.3","2.0.2","2.0.1-rc1","2.0.1","1.1.0-beta","0.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54721.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}