CVE-2026-81888: CSRF (CVSS 5.4)

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.

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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-352 Cross-Site Request Forgery

CWE-1275 CWE-1275

References

Other References

https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1 https://github.com/honojs/middleware/pull/2040 https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6 https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8q

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-81888? +

CVE-2026-81888 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-81888? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-81888