CVE-2026-87812CWE-79cross-site-scripting

CVE-2026-87812

Medium · published September 9, 2026

CVSS v3.1
6.8
EPSS
0%
Percentile
28.8
In the wild
Unconfirmed
What it is

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.

The record
Technical detail
CVSS v3.1
6.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
7.4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00362 · 28.8th 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-rvcf-q4h8-w6c9 · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-bazaar-iconurl · [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 Bazaar iconURL
    cvelistv5