CVE-2026-82653

9.3 criticalEPSS 0.4%

Critical (9.3). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

9.3 critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

CVSS 3.1

8.9 high

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-08-30
Modified: 2026-09-02
Record from: the NVD, synced 2026-10-19

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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