Is CVE-2026-81888 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-81888?

CVE-2026-81888 has a CVSS v3 severity of MEDIUM (5.4).

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CVE-2026-81888

Description

@hono/oauth-providers is Authentication middleware for Hono. Prior to version 0.8.6, the built-in social login providers accept an OAuth callback even when the `state` value is absent on both sides, so the anti-CSRF check passes for a callback that never came from a genuine login attempt. This defeats the `state`-based CSRF protection under default usage. Version 0.8.6 has a patch.