CVE-2026-81888@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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@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.
- CVSS
- 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-352, CWE-1275
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
honojs @hono/oauth-providers honojs:hono_oauth_providers (from the name) | before 0.8.6 | CNA record |
References
- https://github.com/honojs/middleware/security/advisories/GHSA-fm3f-ch8h-qw8qx-refsource-confirm
- https://github.com/honojs/middleware/pull/2040x-refsource-misc
- https://github.com/honojs/middleware/commit/b37765f40b7bddb1d8fce39573b085222dea58c1x-refsource-misc
- https://github.com/honojs/middleware/releases/tag/%40hono%2Foauth-providers%400.8.6x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.