{"id":"CVE-2026-77086","title":"SiYuan before v3.7.4 Path Traversal via packageName","summary":"SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access ca…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-22"],"vendor":"siyuan-note","product":"siyuan","affected":["siyuan < 3.7.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-08-21T11:45:56.651260Z"},"published":"2026-08-21","updated":"2026-10-01","sourceUpdated":"2026-10-01T15:21:13.113Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-77086","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wr4w-7vjm-mmx3","label":"GitHub Security Advisory (GHSA-wr4w-7vjm-mmx3)"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-path-traversal-via-packagename","label":"VulnCheck Advisory: SiYuan before v3.7.4 Path Traversal via packageName"}],"tags":["cve.org"],"epss":0.01028,"epssPercentile":0.62345,"ingestedAt":"2026-10-01T15:48:17.846Z","slug":"CVE-2026-77086","body":"## Overview\n\nSiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.\n\n## Affected\n\n- `siyuan < 3.7.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}