CVE-2026-73042
Stored XSS in SiYuan (<v3.7.4) enables code execution in the Electron process
Is CVE-2026-73042 being exploited?
Not confirmed. CVE-2026-73042 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 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-73042?
CVE-2026-73042 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-2026-73042?
Yes. A fix has been recorded for CVE-2026-73042. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73042 affect?
CVE-2026-73042 affects SiYuan < v3.7.4, Electron-based desktop clients (Windows, macOS, Linux). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73042?
Upgrade to SiYuan v3.7.4+, avoid opening untrusted notes, and harden Electron config
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS in menu metadata allows execution of arbitrary JS in the Electron process, access to Node APIs and local remote code execution/OS access.
Immediate action required
- affected< 3.7.4
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.