CVE-2026-82654CWE-79cross-site-scripting

CVE-2026-82654

High · published August 30, 2026

CVSS v3.1
8.9
EPSS
0%
Percentile
29.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.9 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
CVSS v4.0
9.3 · 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
EPSS
0.00366 · 29.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-30T19:16Z
References (2)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88 · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-block-name · [email protected]
EPSS history
Timeline
  • 01 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 30 AUG 14:33Z
    SiYuan before v3.8.1 Stored XSS via block name
    cvelistv5