CSRF in Honojs @Hono/oauth-Providers
CVE-2026-81888
@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 class: CSRF (Cross-Site Request Forgery)
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
Affected products
- Honojs @Hono/oauth-providers — versions < 0.8.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-81888?
- CVE-2026-81888 is a medium-severity vulnerability in Honojs @Hono/oauth-Providers, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-08-31.
- How severe is CVE-2026-81888?
- Medium severity. CVSS v3 base score is 5.4 out of 10.