CVE-2026-81888 — @hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking
@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 …
Published: 2026-08-31 · CVSS: 5.4 · CVSS 3.1
@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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7