CVE-2026-87811

HighCVSS 7.3/10Last modified Sep 9, 2026

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.

Metrics

CVSS 3.1 7.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-79

Affected software

No affected versions have been published.

Timeline

Published: Sep 9, 2026
Last modified: Sep 9, 2026
NVD status: Deferred

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