CVE-2026-77086

CriticalCVSS 9.1/10Last modified Oct 16, 2026

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-22

Affected software

No affected versions have been published.

Timeline

Published
Aug 21, 2026
Last modified
Oct 16, 2026
NVD status
Deferred

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CVE-2026-77086: Critical severity, CVSS 9.1 | Vulnix