EUVD-2026-64270
GHSA-989h-w3q9-3m2f
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local vector because SiYuan operates as a local application; PR:L and UI:R reflect same-origin access and user-initiated install action; S:C and I:H capture plugin namespace integrity violation with cross-restart persistence.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Plugin integrity bypass in SiYuan before v3.7.4 allows attackers with same-origin access to overwrite trusted, installed plugins by exploiting the bazaar install endpoint's failure to verify that the downloaded package content matches the caller-supplied packageName. By pairing a legitimate plugin's packageName with an attacker-controlled repoURL, an adversary substitutes malicious plugin code that persists across application restarts, achieving durable code execution within the SiYuan application context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires same-origin access to the SiYuan bazaar install HTTP endpoints, meaning the attacker must be able to issue HTTP requests that satisfy the browser same-origin policy - achievable via a malicious script in an open SiYuan browser tab, a compromised browser extension, or direct API access to the localhost server port. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 vector (AV:L/AC:H/AT:P/PR:L/UI:P) scoring 5.9 accurately captures the constrained exploitation surface: local access, high attack complexity, specific preconditions, low privilege, and partial user interaction all limit the realistic threat population. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to SiYuan v3.7.4 or later, which introduces package identity validation in the bazaar install endpoints, as documented in the vendor advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rpx2-p6hp-x5gj. … Detailed patch versions, workarounds, and compensating controls in full report. |
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