CVE-2026-81888

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

Published: Aug 31, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-352

5.4MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-352 CWE-1275

Affected Products

honojs

oss-projectaka hono

@hono/oauth-providersLibrary

OSS Libraries / web-framework

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Initial Access

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References

https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1

github.com

https://github.com/honojs/middleware/pull/2040

github.com

https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6

github.com

and 1 more references View all →

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