---
title: "CVE-2026-29183: SiYuan: Unauthenticated Reflected XSS via SVG Injection in /api/icon/getDynamicIcon Endpoint"
url: https://erroneo.us/security/cve/CVE-2026-29183/
description: "CVE-2026-29183 (github.com/siyuan-note/siyuan/kernel (Go)): SiYuan is a personal knowledge management system. Prior to version 3.5.9, an unauthenticated…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-06
date_modified: 2026-03-06
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-29183"
kev: false
cvss: 9.3
epss: 0.00694
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 52: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 52% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes github.com/siyuan-note/siyuan/kernel (Go) < 0.0.0-20260304034809-d68bd5a79391, fixed in 0.0.0-20260304034809-d68bd5a79391 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/siyuan-note/siyuan/kernel` < 0.0.0-20260304034809-d68bd5a79391 → fixed: 0.0.0-20260304034809-d68bd5a79391

## Affected products (CVE record)

- siyuan-note siyuan: < 3.5.9

## Severity

- GitHub_M CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.69% probability of exploitation activity in the next 30 days; percentile 52.

## Sources

- [GitHub Advisory GHSA-6865-qjcf-286f](https://github.com/advisories/GHSA-6865-qjcf-286f)
- [CVE.org record CVE-2026-29183](https://www.cve.org/CVERecord?id=CVE-2026-29183)
- [NVD entry CVE-2026-29183](https://nvd.nist.gov/vuln/detail/CVE-2026-29183)
- [github.com](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6865-qjcf-286f)
- [github.com](https://github.com/siyuan-note/siyuan/commit/d68bd5a79391742b3cb2e14d892bdd9997064927)

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Source page: https://erroneo.us/security/cve/CVE-2026-29183/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt