Answer in brief
CVE-2026-81888 records a Medium severity (CVSS 5.4) vulnerability in @hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking. The current sources do not mark it as known exploited. The current feed maps honojs/@hono/oauth-providers (generic), @hono/oauth-providers (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps honojs/@hono/oauth-providers (generic), @hono/oauth-providers (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| honojs/@hono/oauth-providersgeneric | < 0.8.6 | Not reported |
| @hono/oauth-providersnpm | <0.8.6 | 0.8.6 |
Published upstream
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 31, 2026
@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.
Quoted source text, attributed separately from HOL analysis.