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CVE-2026-111763

5.7 medium SSVC exploitation: none Published
NVD · CVE.org

A2A Java SDK is the official Java SDK for the Agent2Agent (A2A) Protocol. Prior to 1.3.0.Final, a malicious or compromised remote agent can cause the default JDK-based client to forward a configured API key to a third-party server. When a client application configures credentials through `CredentialService`, `AuthInterceptor.intercept` in `client/transport/spi/src/main/java/org/a2aproject/sdk/client/transport/spi/interceptors/auth/AuthInterceptor.java` uses `APIKeySecurityScheme.name()` from the remote AgentCard directly as the HTTP header name containing the credential, without checking that the declared location is HEADER. JdkA2AHttpClient uses followRedirects(NORMAL), so an agent-controlled cross-origin redirect forwards the custom credential-bearing header even when the standard Authorization header is stripped. The attack requires configured API key credentials for the agent's security scheme and control of the agent's AgentCard and redirect response, but no additional client privileges. This issue is fixed in version 1.3.0.Final.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 15:54
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-21 16:17
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 15:03
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-20 19:48
  5. StatusReceived → PublishedNVD modified 2026-10-20 15:03
  6. First seenCVSS 5.7NVD modified 2026-10-20 16:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 5