CVE-2026-48726: Apache Airflow: revoke_token() unreachable in FabAuthManager / KeycloakAuthManager logout path

[Rahul Vats <rahulvats () apache org>]

Severity: Moderate 

Affected versions:

- Apache Airflow (apache-airflow) before 3.2.2

Description:

A bug in Apache Airflow's auth manager logout handling left previously-issued JWT tokens valid after the user clicked 
logout in the UI: the logout flow for `FabAuthManager` and `KeycloakAuthManager` did not actually reach the underlying 
`revoke_token()` call, so the JWT remained accepted by the API server until its natural expiry. An attacker holding a 
previously-issued JWT for a logged-out user could continue to make authenticated API calls as that user. Affects 
deployments configured with `FabAuthManager` or `KeycloakAuthManager` (the bug does not affect SimpleAuthManager). This 
is a residual gap in the fix for CVE-2025-57735, which addressed cookie-side invalidation in PR #57992 / PR #61339 but 
did not cover the provider-side `revoke_token()` reachability in the FAB / Keycloak code paths. Users who already 
upgraded for CVE-2025-57735 should additionally upgrade to `apache-airflow` 3.2.2 or later to cover the FAB / Keycloak 
logout paths.

Credit:

Bernardo Curi (r3ngar_bugado) (finder)
pierrejeambrun (remediation developer)

References:

https://github.com/apache/airflow/pull/67289
https://www.cve.org/CVERecord?id=CVE-2025-57735
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-48726