medium5.4
CVE-2026-81888
@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking
Impact
@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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @hono/oauth-providers | < 0.8.6 | 0.8.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fm3f-ch8h-qw8q
- https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q
- https://github.com/honojs/middleware/pull/2040
- https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1
- https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6