CVE-2026-81888
@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
@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.
| CWE | CWE-352 CWE-1275 |
| Vendor | honojs |
| Product | @hono/oauth-providers |
| Published | Aug 31, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
honojs / @hono/oauth-providers
< 0.8.6
References
github.com: https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q github.com: https://github.com/honojs/middleware/pull/2040 github.com: https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1 github.com: https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6