CVE-2026-66395

criticalCVSS 9.6covered by 1 sourcefirst seen 2026-07-27

SiYuan desktop before v3.7.2 contains a reflected cross-site scripting vulnerability in the bazaar plugin readme handler that allows attackers to execute arbitrary code by crafting a malicious siyuan:// deep link. Attackers can inject HTML payloads via the plugin name parameter that execute with full Node.js access through insertAdjacentHTML rendering in an insecurely configured Electron renderer.

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Exploitation outlook

Low exploitation risk0.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-66395: SiYuan desktop before v3.7.2 contains a reflected cross-site scripting vulnerability in the ba…nvd · 2026-07-27

External references

NVD record for CVE-2026-66395

CVE.org record

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