{"id":"CVE-2026-100636","title":"SiYuan versions before v3.8.4 contain a path traversal vulnerability in the exportBrowserHTML endpoint that allows authenticated administrators to write arbitrary HTML content to index.html outside the workspace directory","summary":"SiYuan versions before v3.8.4 contain a path traversal vulnerability in the exportBrowserHTML endpoint that allows authenticated administrators to write arbitrary HTML content to index.html outside the workspace directory. Attackers can …","severity":"high","cvss":7.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L","cwe":["CWE-22"],"vendor":"siyuan-note","product":"siyuan","affected":["siyuan < 3.8.4"],"published":"2026-09-26","updated":"2026-09-28","sourceUpdated":"2026-09-28T17:17:43.380","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100636","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-exportbrowserhtml-folder","label":"disclosure@vulncheck.com"},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-28T16:50:30.726443Z"},"ingestedAt":"2026-09-26T13:33:20.925Z","epss":0.00616,"epssPercentile":0.49292,"slug":"CVE-2026-100636","body":"## Overview\n\nSiYuan versions before v3.8.4 contain a path traversal vulnerability in the exportBrowserHTML endpoint that allows authenticated administrators to write arbitrary HTML content to index.html outside the workspace directory. Attackers can supply a folder parameter with directory traversal sequences to escape the export directory and overwrite index.html in any pre-existing kernel-writable location, enabling stored XSS or workspace defacement.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":41.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212042,"id":"CVE-2026-100636","ts":1790615857494,"field":"exploit_available","old":"false","new":"true"}]}