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CVE-2026-81888— @hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking

Quick assessment

Affected
honojs @hono/oauth-providers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hono @hono/oauth-providers是Hono组织开源的一款提供OAuth认证集成的开发组件。 Hono @hono/oauth-providers 0.8.6之前版本存在跨站请求伪造漏洞，该漏洞源于内置社交登录提供商在state值缺失时仍接受OAuth回调，导致基于state的CSRF保护被绕过，容易受到跨站请求伪造攻击。

CVSS 5.4 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs @hono/oauth-providers < 0.8.6 affected
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I. Basic Information for CVE-2026-81888

Vulnerability Information
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Vulnerability Title
@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono @hono/oauth-providers 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono @hono/oauth-providers是Hono组织开源的一款提供OAuth认证集成的开发组件。 Hono @hono/oauth-providers 0.8.6之前版本存在跨站请求伪造漏洞，该漏洞源于内置社交登录提供商在state值缺失时仍接受OAuth回调，导致基于state的CSRF保护被绕过，容易受到跨站请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs @hono/oauth-providers < 0.8.6 -

II. Public POCs for CVE-2026-81888

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III. Intelligence Information for CVE-2026-81888

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Patches & Fixes for CVE-2026-81888 (2)

Vendor Advisories for CVE-2026-81888 (1)

Vendor Pages for CVE-2026-81888 (1)

IV. Related Vulnerabilities

Same vendor: honojs
Same weakness: CWE-352

V. Comments for CVE-2026-81888

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