Medium severity · published Sep 9, 2026
CVE-2026-87812
SiYuan before v3.8.2 Stored XSS via Bazaar iconURL
6.8
CVSS
0.4%
EPSS
No
On KEV
Description
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.8.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87812
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87812
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rvcf-q4h8-w6c9
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-bazaar-iconurl
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