CVE-2026-40922

MEDIUM EPSS 17.4%
Published Apr 17, 20262mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 4.0
Medium
Find Similar
Published Apr 17, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
17.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
b3logsiyuan*≥3.6.1  –  <3.6.4

References 4

  • github.com https://github.com/advisories/GHSA-4663-4mpg-879v
    Third Party Advisory
  • github.com https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428
    Patch
  • github.com https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4
    Release Notes
  • github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428
    Patch