{"id":"CVE-2026-100637","title":"SiYuan versions before v3.8.4 contain a path traversal vulnerability in the checkoutRepo endpoint that allows authenticated administrators to write JSON files outside the workspace","summary":"SiYuan versions before v3.8.4 contain a path traversal vulnerability in the checkoutRepo endpoint that allows authenticated administrators to write JSON files outside the workspace. Attackers can supply a sessionID parameter containing d…","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-73"],"vendor":"siyuan-note","product":"siyuan","affected":["siyuan < 3.8.4"],"published":"2026-09-26","updated":"2026-10-05","sourceUpdated":"2026-10-05T16:17:03.717","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100637","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jhmh-hr4g-c5g2","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.4-path-traversal-via-checkoutrepo-sessionid","label":"disclosure@vulncheck.com"},{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jhmh-hr4g-c5g2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-05T15:06:28.154306Z"},"epss":0.00553,"epssPercentile":0.46022,"ingestedAt":"2026-09-26T13:33:20.924Z","slug":"CVE-2026-100637","body":"## Overview\n\nSiYuan versions before v3.8.4 contain a path traversal vulnerability in the checkoutRepo endpoint that allows authenticated administrators to write JSON files outside the workspace. Attackers can supply a sessionID parameter containing directory traversal sequences to overwrite arbitrary JSON files in pre-existing kernel-writable directories outside workspace boundaries.\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":215893,"id":"CVE-2026-100637","ts":1791217623269,"field":"exploit_available","old":"false","new":"true"}]}