CVE-2026-77086
CRITICAL
NVD
CVSS Score
9.1
Severity
CRITICAL
Published
Aug 21, 2026
Vendor
unknown
Description
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 can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.