# SiYuan: Stored XSS in Attribute View Gallery/Kanban Cover Rendering Allows Arbitrary Command Execution in Desktop Client

Advisory record · `GHSA-rx4h-526q-4458`

- **Identifiers:** `GHSA-rx4h-526q-4458` · `CVE-2026-34448` · `GO-2026-5644`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-94](https://cwe.mitre.org/data/definitions/94.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 31 Mar 2026
- **Updated:** 25 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 31 Mar 2026, 23:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.1: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `github.com/siyuan-note/siyuan/kernel` (Go): affected `<3.6.2`; fixed in `3.6.2`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.1 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0050, the 43rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:06 UTC: First seen by agentprime
- 31 Oct 2026, 15:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-rx4h-526q-4458)

## Sources

- [GitHub Advisory Database: GHSA-rx4h-526q-4458](https://github.com/advisories/GHSA-rx4h-526q-4458)
- [OSV: GHSA-rx4h-526q-4458](https://osv.dev/vulnerability/GHSA-rx4h-526q-4458)
- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rx4h-526q-4458>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-34448>
- <https://github.com/siyuan-note/siyuan/issues/17246>
- <https://github.com/siyuan-note/siyuan>
- <https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-rx4h-526q-4458>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-rx4h-526q-4458/>. Everything for agents: <https://agentprime.io/llms.txt>.