CVE-2026-55570

Description

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, it does not escape the untrusted fields (name, version, author, description) when they are serialized into the data-obj HTML attribute of each marketplace card. Because the attribute is single-quoted and the value is produced with JSON.stringify() (which does not escape ', <, or >), a package whose name contains a single quote breaks out of the attribute and injects arbitrary HTML. In the desktop client the main BrowserWindow runs with nodeIntegration: true, contextIsolation: false, so the injected markup escalates from DOM XSS to arbitrary OS command execution. This is the same root cause and same impact as the original advisory, reached through a sibling sink the patch did not cover. This vulnerability is fixed in 3.7.0.

Severity (CVSS)

Weaknesses

• CWE-79 — CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
• CWE-94 — CWE-94: Improper Control of Generation of Code ('Code Injection')
• CWE-116 — CWE-116: Improper Encoding or Escaping of Output

Affected products

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x88j-wgpr-h22x (x_refsource_CONFIRM)