{"id":"CVE-2026-66396","title":"SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation","summary":"SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor pe…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H","cwe":["CWE-79"],"vendor":"siyuan-note","product":"siyuan","affected":["siyuan < 3.7.2"],"published":"2026-07-27","updated":"2026-09-17","sourceUpdated":"2026-09-17T18:17:03.607","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66396","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial","label":"disclosure@vulncheck.com"},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-07-27T17:27:38.513794Z"},"epss":0.00374,"epssPercentile":0.3113,"ingestedAt":"2026-09-17T18:25:15.982Z","slug":"CVE-2026-66396","body":"## Overview\n\nSiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":58,"depthScoreParts":{"impact":46.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}