{"id":"CVE-2026-54721","state":"PUBLISHED","title":"Silverstripe UserForms: Remote code execution via userforms email subject","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":"2026-08-27T16:52:46.023Z","updatedAt":"2026-08-28T15:58:28.067Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["silverstripe silverstripe-userforms"],"affected":[{"vendor":"silverstripe","product":"silverstripe-userforms","versions":[{"version":"< 6.4.9","status":"affected"},{"version":">= 7.0.0, < 7.0.7","status":"affected"},{"version":">= 7.1.0, < 7.1.1","status":"affected"}]}],"references":["https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6","https://github.com/silverstripe/silverstripe-userforms/pull/1441","https://github.com/silverstripe/silverstripe-userforms/pull/1442","https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702","https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c","https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9","https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7","https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1"],"weaknesses":["CWE-94"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54721.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54721","state":"PUBLISHED","datePublished":"2026-08-27T16:52:46.023Z","dateUpdated":"2026-08-28T15:58:28.067Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T23:07:33.231Z"},"containers":{"cna":{"title":"Silverstripe UserForms: Remote code execution via userforms email subject","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"silverstripe","product":"silverstripe-userforms","versions":[{"version":"< 6.4.9","status":"affected"},{"version":">= 7.0.0, < 7.0.7","status":"affected"},{"version":">= 7.1.0, < 7.1.1","status":"affected"}]}],"references":[{"url":"https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6","name":"https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/pull/1441","name":"https://github.com/silverstripe/silverstripe-userforms/pull/1441","tags":["x_refsource_MISC"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/pull/1442","name":"https://github.com/silverstripe/silverstripe-userforms/pull/1442","tags":["x_refsource_MISC"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702","name":"https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702","tags":["x_refsource_MISC"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c","name":"https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c","tags":["x_refsource_MISC"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9","name":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9","tags":["x_refsource_MISC"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7","name":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7","tags":["x_refsource_MISC"]},{"url":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1","name":"https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-94","lang":"en","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-27T16:52:46.023Z"},"source":{"advisory":"GHSA-g8wr-r2v2-vqc6","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-28T15:45:52.816811Z","id":"CVE-2026-54721","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-28T15:58:28.067Z"}}]}}}