CVE-2026-65606
Protocol-handler XSS in SiYuan -> local OS command execution (pre-3.7.2)
Is CVE-2026-65606 being exploited?
Not confirmed. CVE-2026-65606 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.79% probability of exploitation in the next 30 days.
How severe is CVE-2026-65606?
CVE-2026-65606 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-65606?
Yes. A fix has been recorded for CVE-2026-65606. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-65606 affect?
CVE-2026-65606 affects SiYuan Desktop < v3.7.2 (siyuan:// protocol handler). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-65606?
Update SiYuan to v3.7.2 or later and block untrusted siyuan:// links
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary OS command execution via crafted siyuan:// link exploiting XSS and nodeIntegration:true, enabling full local compromise.
Immediate action required
- affected< 3.7.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.