CVE-2026-93923
published 2026-09-19CVE-2026-93923: SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers…
PriorityP342high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.41%
35.5th percentile
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| siyuan-note | siyuan | <= 3.8.4 | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv4.08.6HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/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
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GHSA
SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting.
ghsa_unreviewed·2026-09-19
CVE-2026-93923 [HIGH] CWE-79 SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting.
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.
VulDB
siyuan-note SiYuan up to 3.8.4 cross site scripting
vuldb·2026-09-19·CVSS 8.8
CVE-2026-93923 [HIGH] siyuan-note SiYuan up to 3.8.4 cross site scripting
A vulnerability, which was classified as problematic, has been found in siyuan-note SiYuan up to 3.8.4. Affected is an unknown function. Performing a manipulation results in cross site scripting.
This vulnerability is known as CVE-2026-93923. Remote exploitation of the attack is possible. No exploit is available.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/siyuan-note/siyuanhttps://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvxhttps://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attributehttps://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
2026-09-19
Published