@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81888
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-31 21:17:52 UTC
Updated2026-09-01 15:17:31 UTC
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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.001490000 probability, percentile 0.043730000 (date 2026-09-03)

Problem Types: CWE-352 | CWE-1275 | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF) | CWE-1275 CWE-1275: Sensitive Cookie with Improper SameSite Attribute

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Honojs @hono/oauth-providers affected < 0.8.6 Not specified

References

ReferenceSourceLinkTags
github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q [email protected] github.com
github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6 [email protected] github.com
github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea... [email protected] github.com
github.com/honojs/middleware/pull/2040 [email protected] github.com
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