Security readout for executives and security teams
Plain-English summary
A malicious SiYuan plugin link can compromise a user’s computer after interaction. In desktop releases before 3.7.2, attacker-controlled content may run operating-system commands with the user’s privileges, potentially exposing files, credentials, and business data or disrupting the device.
Executive priority
Treat this as an urgent desktop remediation. Identify affected installations immediately and upgrade them promptly, beginning with privileged users and sensitive-data environments. User interaction reduces opportunistic risk but does not materially lower the potential business impact of full command execution.
Technical view
The siyuan:// protocol handler places an untrusted icon parameter into a custom tab header using innerHTML when the named plugin is absent. This enables cross-site scripting. Because the desktop renderer has Node integration enabled, injected JavaScript can access Node capabilities, escalating the flaw to arbitrary operating-system command execution.
Likely exposure
Exposure is most likely where SiYuan Desktop versions earlier than 3.7.2 are installed and users can receive or open untrusted siyuan://plugins links. The supplied evidence does not establish exposure for version 3.7.2 or later, or for other SiYuan deployment forms.
Exploitation context
Exploitation requires user interaction with a crafted link but needs no authentication and has low stated complexity. Successful exploitation can affect confidentiality, integrity, and availability beyond the renderer. The supplied sources do not report active exploitation, and the CVE is not identified as being in KEV.
Researcher notes
The vulnerable path is specifically the missing-plugin custom-tab flow in app/src/layout/Tab.ts. Root causes are unescaped insertion into innerHTML and the renderer’s nodeIntegration:true configuration. The cited patch commit is the strongest supplied remediation evidence; no safe testing payload or verified detection signature is provided.
Mitigation direction
- Upgrade SiYuan Desktop to version 3.7.2 or later.
- Prioritize upgrades on systems handling sensitive notes, credentials, or business data.
- Until upgraded, instruct users not to open untrusted siyuan:// links.
- Check the vendor advisory for any additional supported mitigations or release guidance.
Validation and detection
- Inventory SiYuan Desktop installations and record their exact versions.
- Confirm every installation reports version 3.7.2 or later.
- Verify the deployed build includes patch commit 41f2861c87575ff5ac4b50a0520b1a4fe55b4a70.
- Review endpoint telemetry for suspicious processes launched by SiYuan, without reproducing the exploit.
- Confirm controls prevent users from opening untrusted custom-protocol links while upgrades remain incomplete.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-65606 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H2.86VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.4CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- GitHub Security Advisory (GHSA-wp64-x7qh-h728)CVE reference, VulnCheck · vendor-advisory
- Patch CommitCVE reference, VulnCheck · patch
- VulnCheck Advisory: SiYuan before v3.7.2 Cross-Site Scripting to RCECVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.