GHSA-m732-5p4w-x69g Hono Improper Authorization vulnerability
Improper Authorization in Hono (JWT Audience Validation)Hono’s JWT authentication middleware did not validate the `aud` (Audience) claim by default. As a result, applications using the middleware without an explicit audience check could accept tokens intended for other audiences, leading to potential cross-service access (token mix-up).The issue is addressed by adding a new `verification.aud` configuration option to allow RFC 7519–compliant audience validation. This change is classified as a **security hardening improvement**, but the lack of validation can still be considered a vulnerability in deployments that rely on default JWT verification.Recommended secure configurationYou can enable RFC 7519–compliant audience validation using the new `verification.aud` option:Below is the original description by the reporter. For security reasons, it does not include PoC reproduction steps, as the vulnerability can be clearly understood from the technical description.The original description by the reporterSummaryHono’s **JWT Auth Middleware does not provide a built-in `aud` (Audience) verification option**, which can cause **confused-deputy / token-mix-up** issues: an API may accept a valid token that was **issued for a different audience** (e.g., another service) when multiple services share the same issuer/keys. This can lead to unintended cross-service access. Hono’s docs list verification options for `iss/nbf/iat/exp` only, with **no `aud` support**; RFC 7519 requires that when an `aud` claim is present, tokens **MUST** be rejected unless the processing party identifies itself in that claim.**Note:** This problem likely exists in the **JWK/JWKS-based middleware** as well (e.g., `jwk` / `verifyWithJwks`)DetailsThe middleware’s `verifyOptions` enumerate only `iss`, `nbf`, `iat`, and `exp`; there is **no `aud` option**. The same omission appears in the JWT Helper’s “Payload Validation” list. Developers relying on the middleware for complete standards-aligned validation therefore won’t check audience by default.**Standards requirement:** RFC 7519 §4.1.3 states that each principal intended to process the JWT **MUST** identify itself with a value in the `aud` claim; if it does not, the JWT **MUST** be rejected (when `aud` is present). Lack of a first-class `aud` check increases the risk that tokens issued for **Service B** are accepted by **Service A**.**Real-world effect:** In deployments with a single IdP/JWKS and shared keys across multiple services, a token minted for one audience can be mistakenly accepted by another audience unless developers implement a custom audience check.For example, with Google Identity (OIDC), iss is always https://accounts.google.com (shared across apps), but aud differs per application because it is that app’s OAuth client ID; therefore, an attacker can host a separate service that supports “Sign in with Google,” obtain a valid ID token (JWT) for the victim user, and—if your API does not verify aud—use that token to access your API with the victim’s privileges.Impact**Type:** Authentication/authorization weakness via **token mix-up (confused-deputy)**.**Who is impacted:** Any Hono user who:shares an issuer/keys across multiple services (common with a single IdP/JWKS)distinguishes tokens by intended recipient using `aud`.**What can happen:****Cross-service access:** A token for *Service B* may be accepted by *Service A*.**Boundary erosion:** ID tokens and access tokens, or separate API audiences, can be inadvertently intermixed.This may causes unauthorized invocation of sensitive endpoints.**Recommended remediation:**Add `verifyOptions.aud` (`string | string[] | RegExp`) to the middleware and enforce RFC 7519 semantics: In [verify method](https://github.com/honojs/hono/blob/db764c2f1d8a2905d66c78c41aa47e47d3a4165d/src/utils/jwt/jwt.ts#L99-L156), if `aud` is present and does not match with specified audiences, reject.Ensure equivalent `aud` handling exists in the JWK/JWKS flow (`jwk` middleware / `verifyWithJwks`) so users of external IdPs can enforce audience consistently.
CVSS v3.1 score: 8.1