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The vulnerability arises because the default task store configuration in the A2A Java SDK performs no authorization checks on task reads. Specifically, the InMemoryTaskStore’s no-arg constructor initializes the authorization provider as null, and the get(String taskId) method executes a bare map lookup without validating the caller’s permissions. Authorization is only enforced when an application explicitly supplies a task authorization provider and routes requests through the specific CDI-based authorization decorator. Consequently, deployments using the default store, manual handler building, or non-CDI stacks like Spring completely bypass authorization checks. This insecure default allows an unauthenticated or unauthorized caller to read sensitive task details—including status, context, message history, and artifacts—simply by knowing or guessing the task identifier.
DailyCVE Form:
Platform: Maven
Version: <= 1.2.0.Final
Vulnerability : Missing Authorization
Severity: High
date: 2026-06-01
Prediction: 2026-06-15
What Undercode Say
Bash Commands and Codes
InMemoryTaskStore store = new InMemoryTaskStore();
store.save(victimTask, false);
Task task = store.get("victim-task-42");
Exploit: (Educational Purposes!)
InMemoryTaskStore store = new InMemoryTaskStore();
Task leakedTask = store.get("victim-task-42");
Protection:
Configure a TaskAuthorizationProvider and route requests through the authorization decorator or upgrade to a patched release.
Impact:
Allows arbitrary callers to enumerate and read sensitive cross-boundary task data, message history, and artifacts without authentication.
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Sources:
Reported By: github.com
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