Vulnerability Description
SiYuan is an open-source personal knowledge management system. In versions 3.6.1 through 3.6.3, a prior fix for XSS in bazaar README rendering (incomplete fix for CVE-2026-33066) enabled the Lute HTML sanitizer, but the sanitizer does not block iframe tags, and its URL-prefix blocklist does not effectively filter srcdoc attributes which contain raw HTML rather than URLs. A malicious bazaar package author can include an iframe with a srcdoc attribute containing embedded scripts in their README. When other users view the package in SiYuan's marketplace UI, the payload executes in the Electron context with full application privileges, enabling arbitrary code execution on the user's machine. This issue has been fixed in version 3.6.4.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| B3Log | Siyuan | >= 3.6.1, < 3.6.4 |
Related Weaknesses (CWE)
References
- https://github.com/advisories/GHSA-4663-4mpg-879vThird Party Advisory
- https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d74Patch
- https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4Release Notes
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jgExploitThird Party Advisory
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jgExploitThird Party Advisory
FAQ
What is CVE-2026-40922?
CVE-2026-40922 is a vulnerability with a CVSS score of 5.4 (MEDIUM). SiYuan is an open-source personal knowledge management system. In versions 3.6.1 through 3.6.3, a prior fix for XSS in bazaar README rendering (incomplete fix for CVE-2026-33066) enabled the Lute HTML...
How severe is CVE-2026-40922?
CVE-2026-40922 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40922?
Check the references section above for vendor advisories and patch information. Affected products include: B3Log Siyuan.