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.

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.

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.

Affected products

Siyuan-note Siyuan

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (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.