Vulnerability in Siyuan-Note Siyuan
CVE-2026-62204
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.001 (0.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-rpx2-p6hp-x5gj (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-plugin-overwrite-via-bazaar-install (third-party-advisory)
Frequently asked questions
- What is CVE-2026-62204?
- CVE-2026-62204 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.6/10. Published 2026-08-22.
- How severe is CVE-2026-62204?
- Medium severity. CVSS v3 base score is 6.6 out of 10.