High severity · published Jul 9, 2026
CVE-2026-59833
SiYuan: Stored XSS to RCE in SiYuan via a per-attribute URL-scheme sanitizer gap in Lute (form action / SVG xlink:href)
8.6
CVSS
0.5%
EPSS
No
On KEV
Description
SiYuan is an open-source personal knowledge management system. Prior to 3.7.1, SiYuan renders note and package content to HTML through the Lute engine with sanitization enabled, but Lute's dangerous javascript scheme block does not check form action or SVG xlink:href attributes, allowing stored cross-site scripting in document export-preview and Bazaar package README render paths that can execute OS commands in the Electron desktop renderer. This issue is fixed in versions 3.7.1.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
< 3.7.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59833
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59833
github.com
https://github.com/siyuan-note/siyuan/commit/ebe252e61fb93f258d083b9da0fa403679fdf94a
github.com
https://github.com/siyuan-note/siyuan/releases/tag/v3.7.1
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-97xv-3v84-h358
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