SiYuan before v3.8.2 Information Disclosure via undoState

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

• siyuan-note siyuan

  • 3.8.2not affected
  • before 3.8.2affected · semver

Other highest-scoring records for the same primary product.

• CVE-2026-66012SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP
  40Plan
• CVE-2026-72811SiYuan before v3.7.4 SQL Injection via backlink search
  39Monitor
• CVE-2026-69085SiYuan before v3.7.3 SQL Injection via searchDocs
  39Monitor
• CVE-2026-69084SiYuan before v3.7.3 SQL Injection via searchEmbedBlock
  39Monitor
• CVE-2026-69083SiYuan before v3.7.3 SQL Injection via fullTextSearchAssetContent
  39Monitor
• CVE-2026-54158SiYuan: Stored XSS to RCE via attribute-view cell rendering in genAVValueHTML()
  39Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const invoice = await Invoice.findById(req.params.id);2res.json(invoice);

1const invoice = await Invoice.findOne({2  id: req.params.id,3  ownerId: req.user.id,4});5if (!invoice) return res.sendStatus(404);6res.json(invoice);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.