CVE-2026-82654
SiYuan before v3.8.1 Stored XSS via block name
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 30, 2026
- Updated
- Sep 1, 2026
- Reserved
- Aug 30, 2026
Description
SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L | VulnCheck |
| 3.1 | 8.9 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L | 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-hf87-qh3j-3p88)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.8.1 Stored XSS via block namethird-party-advisory
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