Vulnerabilities CVE-2026-77086

CVE-2026-77086

Critical

Open

TLP:CLEAR

SiYuan before v3.7.4 Path Traversal via packageName

NVD CVE.org

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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.

Details

CVSS Score: 9.4
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Confidence: 90%
Published: Aug 21, 2026
Last Modified: Aug 21, 2026

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