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CVE-2026-62204

SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install

MEDIUM
6.6
CVSS Score
Published: August 22, 2026 at 12:26 PM UTC
Updated: October 12, 2026 at 04:10 PM UTC
2 products affected across 2 vendorsSiyuanSiyuan

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Severity
MEDIUM6.6
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Siyuan· B3LOG
95%
v < 3.7.4
Affected range stops below 3.7.4, so it looks safe — our inference, not a vendor statement
Siyuan· Siyuan Notego
90%
0 ≤ v < 3.7.40
Vendor states this is fixed in 3.7.4 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rpx2-p6hp-x5gj
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/siyuan-before-plugin-overwrite-via-bazaar-install

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.6MEDIUMVulnCheck
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-345

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