# SiYuan: Localhost-trust admin bypass on auth-code-gated endpoints, with potential remote reachability via the fixed-port proxy

Advisory record · `GHSA-3mp7-4rh5-jrv9`

- **Identifiers:** `GHSA-3mp7-4rh5-jrv9` · `CVE-2026-72809` · `GO-2026-6386`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-290](https://cwe.mitre.org/data/definitions/290.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md)
- **Published:** 3 Sept 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Sept 2026, 22:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/siyuan-note/siyuan/kernel` (Go): affected `<0.0.0-20260723031701-9c16e9851f0b`; fixed in `0.0.0-20260723031701-9c16e9851f0b`

## 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

- 7.1 High, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0030, the 23rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:13 UTC: First seen by agentprime
- 31 Oct 2026, 14:13 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-3mp7-4rh5-jrv9)

## Sources

- [GitHub Advisory Database: GHSA-3mp7-4rh5-jrv9](https://github.com/advisories/GHSA-3mp7-4rh5-jrv9)
- [OSV: GHSA-3mp7-4rh5-jrv9](https://osv.dev/vulnerability/GHSA-3mp7-4rh5-jrv9)
- <https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3mp7-4rh5-jrv9>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-72809>
- <https://github.com/siyuan-note/siyuan/commit/9c16e9851f0b5d7ed179e5c2fca15a7724666871>
- <https://github.com/siyuan-note/siyuan>
- <https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-localhost-trust>

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-3mp7-4rh5-jrv9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-3mp7-4rh5-jrv9/>. Everything for agents: <https://agentprime.io/llms.txt>.