CVE-2026-87811EPSS p28.2%

CVE-2026-87811CVE-2026-87811

Description

SiYuan before v3.8.2 inserts persisted notebook template paths into HTML input value attributes without proper attribute encoding. Attackers can craft malicious template paths that break out of the attribute context and execute JavaScript when a victim opens notebook configuration, enabling same-origin API requests and application state manipulation.

Scoring

CVSS 7.3 ()
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
EPSS0.37% probability of exploitation · percentile 28.2% · 2026-10-05T12:00:23Z
Last modified2026-09-09
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.