Medium severity · published Aug 22, 2026
CVE-2026-62204
SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install
6.6
CVSS
0.1%
EPSS
No
On KEV
Description
SiYuan versions before v3.7.4 fail to validate that packageName matches the downloaded package content in bazaar install endpoints. Attackers with same-origin access can overwrite existing trusted plugins by supplying mismatched packageName and repoURL parameters, achieving persistence across application restarts.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
High
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.7.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62204
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62204
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rpx2-p6hp-x5gj
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-plugin-overwrite-via-bazaar-install
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