CVE-2026-93923

high

Description

SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.

References

https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx

https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76

https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194

https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133

https://github.com/siyuan-note/siyuan

Details

Source: Mitre, NVD

Published: 2026-09-19

Updated: 2026-09-19

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 8.6

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: High