SiYuan: Stored XSS to RCE via attribute-view cell rendering in genAVValueHTML()

Summary

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the attribute-view (database) cell renderer genAVValueHTML interpolates cell content raw in four of its branches: text, url, phone, and mAsset. A cell value like </textarea><img src=x onerror="..."> or "><img src=x onerror="..."> breaks out of its surrounding tag and runs arbitrary JavaScript in the renderer when the victim opens the block-attribute panel. On Electron desktop the renderer runs with nodeIntegration:true, so the XSS chains to host RCE via require('child_process'). AV files live under the workspace and ride normal sync, so an attacker with write access to any synced workspace plants the payload once and it fires on every device that opens a panel containing that row.he kernel doesn't escape on the way in either, so the malicious cell persists byte-for-byte. There's no equivalent of the html.EscapeAttrVal call that protects block IAL attributes at kernel/model/blockial.go:261. This vulnerability is fixed in 3.7.0.

Timeline

1. Jun 24, 2026, 9:19 PM UTCCVE published
2. Jun 25, 2026, 11:11 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: no · Technical impact: total

3. Jun 25, 2026, 11:12 PM UTCRecord last updated

Affected versions

• siyuan-note siyuan

  fixed in 3.7.0

• github.com/siyuan-note/siyuan/kernelGo

  fixed in 0.0.0-20260628153353-2d5d72223df4

References 1