PT-2026-24464 · Siyuan · Siyuan

0Xkakash1 · Published 2026-03-10 · Updated 2026-03-25 · CVE-2026-31809

Positive Technologies (AI Summary)

CVSS v4.0

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.5.10

Description SiYuan is a personal knowledge management system susceptible to a reflected cross-site scripting (XSS) condition. The SVG sanitizer, SanitizeSVG, inadequately checks href attributes for the 'javascript:' prefix. Specifically, the use of ASCII tab ( ), newline ( ), or carriage return ( ) characters within the 'javascript:' string bypasses the prefix check. This allows for the injection of executable JavaScript code. The vulnerable API endpoint is /api/icon/getDynamicIcon, and the issue stems from insufficient sanitization of input provided to the href attribute. This is a second bypass of a previous fix.

Recommendations Update SiYuan to version 3.5.10 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-31809

GHSA-PMC9-F5QR-2PCR

GO-2026-4669

SUSE-SU-2026:1042-1

Affected Products

Siyuan

References · 135

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31809.json · Exploit
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pmc9-f5qr-2pcr · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-pmc9-f5qr-2pcr · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4669 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31809 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:1042-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-31809 · Vendor Advisory
• https://github.com/siyuan-note/siyuan · Note
• https://github.com/siyuan-note/siyuan/releases/tag/v3.5.10 · Note
• https://suse.com/security/cve/CVE-2026-31960 · Note
• https://suse.com/security/cve/CVE-2026-28789 · Note
• https://suse.com/security/cve/CVE-2026-27945 · Note
• https://suse.com/security/cve/CVE-2026-29781 · Note
• https://suse.com/security/cve/CVE-2026-27808 · Note
• https://suse.com/security/cve/CVE-2026-30933 · Note