CVE-2026-54721

{"id": "CVE-2026-54721", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54721", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-28T15:45:52.816811Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "silverstripe", "product": "silverstripe-userforms", "versions": [{"status": "affected", "version": "< 6.4.9"}, {"status": "affected", "version": ">= 7.0.0, < 7.0.7"}, {"status": "affected", "version": ">= 7.1.0, < 7.1.1"}]}]}], "published": "2026-08-27T20:17:49.973", "references": [{"url": "https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/pull/1441", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/pull/1442", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-94"}]}], "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."}], "lastModified": "2026-09-09T21:09:13.080", "sourceIdentifier": "security-advisories@github.com"}