CVE-2026-77086

critical · 9.4

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.

9.4

CVSS

1.0%

EPSS (exploit prob.)

63rd

EPSS percentile

2026-08-21

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-22

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-77086