# CVE-2026-72810: SiYuan publish-boundary bypass via WebSocket broadcast

Source: https://junglewise.ai/threats/cve-2026-72810-siyuan-publish-boundary-bypass-via-websocket-broadcast  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-72810 · Severity: high · CVSS 8.6 · Published 2026-09-03

SiYuan is a note-taking and knowledge management application that supports a publish mode for sharing content. This vulnerability allows anonymous readers or any user with read access in publish mode to passively receive a live, real-time stream of all document edits—including those marked as password-protected, unpublished, or forbidden—by simply keeping a WebSocket connection open. The attacker gains access to sensitive metadata and content without any active interaction, defeating all publish-access and password protections for edits made while connected.

Technologies: [github.com/siyuan-note/siyuan/kernel (Go)](https://junglewise.ai/threats/technologies/github-com-siyuan-note-siyuan-kernel), [SiYuan](https://junglewise.ai/threats/technologies/siyuan). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [SiYuan](https://junglewise.ai/threats/vendors/siyuan).

## Quick answers

**Is CVE-2026-72810 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-72810 being exploited in the wild.

**How severe is CVE-2026-72810?** High severity, with a CVSS score of 8.6, published 3 September 2026.

**Which products and versions are affected?** github.com/siyuan-note/siyuan/kernel (Go) < 0.0.0-20260723013612-ba948639d7f6, SEMVER:introduced=0,fixed=0.0.0-20260723013612-ba948639d7f6; SiYuan < 0.0.0-20260723013612-ba948639d7f6.

**Is there a fix for CVE-2026-72810?** Yes. github.com/siyuan-note/siyuan/kernel (Go): upgrade to 0.0.0-20260723013612-ba948639d7f6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-72810 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-72810?** Check whether you run github.com/siyuan-note/siyuan/kernel (Go) or SiYuan at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/siyuan-note/siyuan/kernel (Go): upgrade to 0.0.0-20260723013612-ba948639d7f6 or later

  ```sh
  go get github.com/siyuan-note/siyuan/kernel@v0.0.0-20260723013612-ba948639d7f6
  ```


## Technical details

The vulnerability is a missing authorization check (CWE-862) in SiYuan's WebSocket broadcast mechanism used for real-time synchronization. When publish mode is enabled with authentication disabled, the `HandleConnect` function admits anonymous `RoleReader` tokens and registers them in the same broadcast session pool as authenticated clients. The kernel's broadcast functions (`Broadcast`, `broadcastOthers`, etc.) transmit content events—including document transactions with DOM rendering, create/save events, move/rename operations—to all sessions in the pool without applying any publish-access, publish-password, or role-based filtering. The `isPublish` flag exists on sessions but is only used to send a service-closed notice, not to gate content. Because events are pushed directly over WebSocket from the kernel's edit pipeline, they bypass all HTTP-layer publish-access filters. A network-reachable attacker with no privileges can open a WebSocket connection to the publish surface (port 6808) and passively receive unfiltered edits, including metadata and content from password-protected or unpublished documents, as long as they hold the connection open while edits occur. Patch 0.0.0-20260723013612-ba948639d7f6 is available.

## Affected products

- siyuan-note siyuan < 0.0.0-20260723013612-ba948639d7f6

## Identifiers

- CVE-2026-72810
- GHSA-mw8r-mw84-88v2
- GO-2026-6400

## Timeline

- 2026-09-03: disclosed: GitHub Security Advisory published
- 2026-07-23: patched: Patch commit ba948639d7f6 available

## References

- [https://api.github.com/users/Shirshakhtml](https://api.github.com/users/Shirshakhtml)
- [https://github.com/Shirshakhtml](https://github.com/Shirshakhtml)
- [https://api.github.com/users/Shirshakhtml/gists%7B/gist_id%7D](https://api.github.com/users/Shirshakhtml/gists%7B/gist_id%7D)
- [https://api.github.com/users/Shirshakhtml/repos](https://api.github.com/users/Shirshakhtml/repos)
- [https://avatars.githubusercontent.com/u/75179984?v=4](https://avatars.githubusercontent.com/u/75179984?v=4)
- [https://api.github.com/users/Shirshakhtml/events%7B/privacy%7D](https://api.github.com/users/Shirshakhtml/events%7B/privacy%7D)

## Related threats

- [SiYuan path traversal in web fetch](https://junglewise.ai/threats/cve-2026-126776-siyuan-3-7-0-before-3-8-10-on-windows-contains-a-path-traversal)
- [SiYuan publish filter information disclosure in local storage](https://junglewise.ai/threats/go-2026-6836-siyuan-the-publish-filter-for-local-storage-returns-the-7f022e62)
- [SiYuan path traversal via GLOBALROOT alias bypass](https://junglewise.ai/threats/cve-2026-118680-siyuan-3-8-7-through-3-8-8-fails-to-normalize-windows-globalroot)
- [SiYuan SQL injection in history search](https://junglewise.ai/threats/cve-2026-116170-siyuan-before-v3-8-7-contains-an-sql-injection-vulnerability)
- [SiYuan cross-site scripting in /check-auth redirect](https://junglewise.ai/threats/cve-2026-116167-siyuan-from-2-9-0-before-3-8-7-contains-a-cross-site-scripting)