Vulnerability Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an <img src="..."> attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. This issue has been patched in version 3.6.2.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| B3Log | Siyuan | < 3.6.2 |
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/issues/17246Issue Tracking
- https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2Release Notes
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rx4h-526q-4458ExploitVendor Advisory
FAQ
What is CVE-2026-34448?
CVE-2026-34448 is a vulnerability with a CVSS score of 9.0 (CRITICAL). SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gall...
How severe is CVE-2026-34448?
CVE-2026-34448 has been rated CRITICAL with a CVSS base score of 9.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-34448?
Check the references section above for vendor advisories and patch information. Affected products include: B3Log Siyuan.