CVE-2026-29183

critical · 9.3

A public exploit / detection template exists

Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →

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.

9.3

CVSS

0.6%

EPSS (exploit prob.)

49th

EPSS percentile

2026-03-06

Published

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

Weaknesses

CWE-79

Affected products

Vendor	Product	Affected versions
b3log	siyuan	< 3.5.9

Check a specific version with /api/v1/cve/match.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6865-qjcf-286f

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-29183