CVE-2026-87813CWE-79cross-site-scripting

CVE-2026-87813

High · published September 9, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
29.3
In the wild
Unconfirmed
What it is

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the Search Assets result list where asset filenames are interpolated into HTML without escaping. Authenticated attackers can craft asset filenames containing malicious markup that executes JavaScript in the victim's browser when searching assets, enabling same-origin API requests and application state 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 · 29.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-09T16:17Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-qcw6-qm34-28h8 · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-unescaped-asset-filenames · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-qcw6-qm34-28h8 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 11 SEP 03:19Z
    EPSS moved — → 0%
    epss
  • 09 SEP 11:21Z
    SiYuan before v3.8.2 Stored XSS via unescaped asset filenames
    cvelistv5