# SiYuan Bazaar marketplace renders unescaped package \`name\` and \`version\` metadata, allowing stored XSS and Electron code execution

Advisory record · `GHSA-27qc-m5gf-jv5r`

- **Identifiers:** `GHSA-27qc-m5gf-jv5r` · `CVE-2026-45375` · `GO-2026-5001`
- **State:** Confirmed
- **Severity:** CVSS 9.0 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-116](https://cwe.mitre.org/data/definitions/116.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md)
- **Published:** 13 May 2026
- **Updated:** 8 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 13 May 2026, 15:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.0: 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 `<=0.0.0-20260421031503-96dfe0bea474`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> SiYuan Bazaar in github.com/siyuan-note/siyuan/kernel, up to and including 0.0.0-20260421031503-96dfe0bea474, displays package name and version fields without HTML escaping. A package with malicious markup in these fields runs script when a user opens Settings → Marketplace, which in the Electron desktop app can execute OS commands. No fixed version is listed; avoid installing packages from untrusted sources.

Written 7 Nov 2026.

## 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

- 9.0 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:** 0.0032, the 24th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:08 UTC: First seen by agentprime
- 31 Oct 2026, 15:08 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-27qc-m5gf-jv5r)

## Sources

- [GitHub Advisory Database: GHSA-27qc-m5gf-jv5r](https://github.com/advisories/GHSA-27qc-m5gf-jv5r)
- [OSV: GHSA-27qc-m5gf-jv5r](https://osv.dev/vulnerability/GHSA-27qc-m5gf-jv5r)
- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-27qc-m5gf-jv5r>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-45375>
- <https://github.com/siyuan-note/siyuan>

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-27qc-m5gf-jv5r>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-27qc-m5gf-jv5r/>. Everything for agents: <https://agentprime.io/llms.txt>.