CVE-2026-62204 PUBLISHED

SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install

Assigner: VulnCheck
Reserved: 13.07.2026 Published: 22.08.2026 Updated: 22.08.2026

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: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 Score: 5.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	Low	Confidentiality	Low
Attack Complexity	High	Integrity	High	Integrity	High
Attack Requirements	Present	Availability	Low	Availability	Low
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L
CVSS Score: 6.6

Attack Vector	Local	Scope	Changed
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	High
User Interaction	Required	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	siyuan-note
Product	siyuan
Versions	Default: unaffected affected from 0 to 3.7.4 (excl.) Version 3.7.4 is unaffected

CVE-2026-62204 PUBLISHED

SiYuan before v3.7.4 Plugin Overwrite via Bazaar Install

Metrics

Product Status

Credits

References

Problem Types