CVE-2026-29183: SiYuan: Unauthenticated Reflected XSS via SVG Injection in /api/icon/getDynamicIcon Endpoint

March 4, 2026 (updated March 6, 2026)

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.

References

Code Behaviors & Features

Detect and mitigate CVE-2026-29183 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →