CVE-2026-84178Apache Camel: Camel-OAuth Login Cross-Site Request Forgery via Missing State Binding in the Authorization Code Flow

Official description

Cross-Site Request Forgery (CSRF) vulnerability in Apache Camel OAuth component. This issue affects Apache Camel: from 4.11.0 before 4.18.5, from 4.19.0 before 4.22.1. The authorization code callback did not carry a state parameter binding it to the authorization request that started the flow, and the callback did not verify one. An authorization code obtained in any browser could therefore be redeemed at the callback and associated with whichever session presented it, which is login cross-site request forgery: a victim can be silently signed in as an identity the attacker controls, so that actions the victim then performs, and data they then submit, land in the attacker's account. The same unvalidated callback handling also allowed the post-authentication redirect target to be influenced, giving an open redirect from a trusted origin. The state check runs before the authorization code is redeemed, so these paths are reachable without any interaction with the identity provider. Upgrade to Apache Camel 4.23.0, which fixes the issue. Users on the 4.18.x LTS releases stream should upgrade to 4.18.5. Users on the 4.22.x LTS releases stream should upgrade to 4.22.1. The authorization request now issues a state value bound to the session, and the callback rejects a request whose state is absent or does not match, stopping the route with a 400 response. For deployments that cannot upgrade immediately, terminate the authorization code flow in a component that performs its own state binding rather than relying on the Camel callback. Note that after upgrading, a deployment behind a proxy that drops or rewrites the callback query string will begin to see 400 responses, because the state parameter must survive the round trip.

Affected products (as reported)

References

• Apache Camel Security Advisory - CVE-2026-84178 vendor-advisory
• CAMEL-24437 issue-tracking
• Fix on main, released in 4.23.0 (commit 495c5ad39a0f95f823da512b38da5c19609e2a1c) patch
• Backport to camel-4.22.x, released in 4.22.1 (commit 95b4c1500001bc32877df5b8fca0bc7bdd080666) patch
• Backport to camel-4.18.x, released in 4.18.5 (commit 4ec9b37d70b08c478966000fb1bd653abfe410e3) patch