CVE-2026-81888
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
@hono/oauth-providers before version 0.8.6 accepts an OAuth callback even when the 'state' value is absent on both sides, making the 'state'-based anti-CSRF protection ineffective. An attacker can exploit this to perform CSRF attacks on social login.
Risk Assessment
An attacker can force a user to log into the attacker's account or perform unauthorized actions in the context of the victim's session, potentially leading to account security breaches.
Recommendation
Update @hono/oauth-providers to version 0.8.6 or later, which includes a fix enforcing the presence and matching of the state parameter.
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Original NVD description (English source)
@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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

