Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-62204

Severity CVSS v4.0:
MEDIUM
Type:
CWE-345 Insufficient Verification of Data Authenticity
Publication date:
22/08/2026
Last modified:
22/08/2026

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.

Impact

Vector 4.0
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L CVSS v4.0 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L

Attack Vector (AV): Local
Attack Complexity (AC): High
Attack Requirements (AT): Present
Privileges Required (PR): Low
User Interaction (UI): Passsive
Confidentiality (VC): Low
Integrity (VI): High
Availability (VA): Low
Confidentiality (SC): Low
Integrity (SI): High
Availability (SA): Low

Base Score 4.0
5.90
Severity 4.0
MEDIUM
Vector 3.x
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L CVSS v3.1 Severity and Metrics:

Base Score: 6.60 MEDIUM
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): Required
Scope (S): Changed
Confidentiality (C): Low
Integrity (I): High
Availability (A): Low

Base Score 3.x
6.60
Severity 3.x
MEDIUM

References to Advisories, Solutions, and Tools