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Vulnerability record · CVE-2026-87814 · published 9 September 2026

CVE-2026-87814: Cross-site scripting vulnerability

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the search asset preview feature that fails to escape indexed asset content before inserting it into the DOM using innerHTML. Attackers who can place crafted text assets in a workspace can execute JavaScript in the SiYuan origin when victims preview the assets, enabling authenticated API requests and workspace manipulation.

8.4 CVSS 4.0 High EPSS 0.37% · top 72.1% CWE-79 · Cross-site scripting Deferred
8.4CVSS 4.0 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
18 Sep 2026Last modified by NVD

Description

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the search asset preview feature that fails to escape indexed asset content before inserting it into the DOM using innerHTML. Attackers who can place crafted text assets in a workspace can execute JavaScript in the SiYuan origin when victims preview the assets, enabling authenticated API requests and workspace manipulation.

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

References

LinkTags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-64gp-333q-mq6j
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-asset-preview

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Source: NIST National Vulnerability Database (record CVE-2026-87814), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.