CVE-2026-77086

CRITICAL 9.1

SiYuan before v3.7.4 Path Traversal via packageName

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	siyuan-note
Product	siyuan
Published	Aug 21, 2026
Last Updated	Aug 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

siyuan-note / siyuan

0 < 3.7.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wr4w-7vjm-mmx3 vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-path-traversal-via-packagename

Credits

🔍 alham-rizvi