CVE-2026-87811
SiYuan before v3.8.2 Stored XSS via notebook template paths
- State
- Published
- Severity
- 8.4 High
- Published
- Sep 9, 2026
- Updated
- Sep 9, 2026
- Reserved
- 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.4 High | 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 | VulnCheck |
| 3.1 | 7.3 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-v6wf-r2gr-rrgf)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.8.2 Stored XSS via notebook template pathsthird-party-advisory
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