CVE-2026-87814CWE-79cross-site-scripting

CVE-2026-87814

High · published September 9, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
29.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
8.4 · 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
EPSS
0.00367 · 29.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-09T16:17Z
References (2)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-64gp-333q-mq6j · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-asset-preview · [email protected]
EPSS history
Timeline
  • 11 SEP 03:19Z
    EPSS moved — → 0%
    epss
  • 09 SEP 11:21Z
    SiYuan before v3.8.2 Stored XSS via Asset Preview
    cvelistv5