PT-2026-33376 · Siyuan · Siyuan

Published 2026-03-14 · Updated 2026-04-17 · CVE-2026-40922

Positive Technologies (AI Summary)

CVSS v2.0

5.5

Medium

Base vector

AV:N/AC:L/Au:S/C:P/I:P/A:N

Name of the Vulnerable Software and Affected Versions SiYuan versions 3.6.1 through 3.6.3

Description An issue exists in the bazaar README rendering where the Lute HTML sanitizer fails to block iframe tags and does not effectively filter srcdoc attributes containing raw HTML. A malicious bazaar package author can include an iframe with a srcdoc attribute containing embedded scripts in their README. When users view the package in the marketplace UI, the payload executes in the Electron context with full application privileges, allowing arbitrary code execution on the user's machine.

Recommendations Update to version 3.6.4.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BDU:2026-07547

CVE-2026-40922

GHSA-8Q5W-MMXF-48JG

Affected Products

Siyuan

References · 10

• 🔥 https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8q5w-mmxf-48jg · Exploit
• https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-40922 · Security Note
• https://osv.dev/vulnerability/GHSA-8q5w-mmxf-48jg · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33066 · Security Note
• https://bdu.fstec.ru/vul/2026-07547 · Security Note
• https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4 · Note
• https://github.com/siyuan-note/siyuan · Note
• https://twitter.com/CVEnew/status/2045102631371125246 · Twitter Post
• https://github.com/advisories/GHSA-4663-4mpg-879v · Note