CVE-2026-82653: SiYuan before v3.8.1 Stored XSS via confirmDialog

Severity: high (CVSS 8.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-30 · updated 2026-09-02
Weakness: CWE-79

Description

SiYuan before v3.8.1 contains a stored cross-site scripting vulnerability in confirmDialog() where unescaped package names and notebook names are interpolated directly into innerHTML assignments. Attackers can submit malicious bazaar packages with HTML/script payloads in the name field that execute in users' browsers when uninstalling packages or unlocking encrypted notebooks.

Affected products

siyuan-note siyuan: before 3.8.1 — fixed in 3.8.1

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.1. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvwp-43j9-4xgf
https://www.vulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-confirmdialog
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvwp-43j9-4xgf

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