Is CVE-2026-116166 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-116166?

CVE-2026-116166 has a CVSS v3 severity of MEDIUM (6.8).

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CVE-2026-116166

Description

SiYuan 3.6.0 before 3.8.7 accepts and persists the networkServeTLS setting but never enforces it, so the kernel port keeps serving full API access over plain HTTP alongside HTTPS. Network-adjacent attackers can sniff the cleartext login flow and session cookie, which lacks the Secure attribute while responses omit HSTS, to hijack kernel API sessions.