๐Ÿ›ก๏ธ CVE-2026-29183
๐Ÿ”ด CVSS 9.5 โ€” Critical โœ… No Known Exploit CWE-79 NVD
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

SiYuan is a personal knowledge management system. Prior to version 3.5.9, an unauthenticated reflected XSS vulnerability exists in the dynamic icon API endpoint "GET /api/icon/getDynamicIcon" when type=8, attacker-controlled content is embedded into SVG output without escaping. Because the endpoint is unauthenticated and returns image/svg+xml, a crafted URL can inject executable SVG/HTML event handlers (for example onerror) and run JavaScript in the SiYuan web origin. This can be chained to perform authenticated API actions and exfiltrate sensitive data when a logged-in user opens the malicious link. This issue has been patched in version 3.5.9.

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE CWE-79
Public Exploit โœ… No
Source NVD
Published 2026-03-04
Updated 2026-06-15
Modified 2026-04-02
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/siyuan-note/siyuan/kernel โ€” โ€”
siyuan โ€” 3.5.9

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