CVE-2026-40969 Spring gRPC AuthenticationException message reflected to remote client

The raw message of every server-side AuthenticationException is returned to the unauthenticated remote caller in the gRPC status description. This allows an attacker to obtain information about the authentication failure, which may be useful for further attacks. Affected versions: Spring gRPC:...

CVE-2026-40969

CVE-2026-40969 affects Spring gRPC 1.0.0–1.0.2, where the server-side AuthenticationException message is echoed in the gRPC status description returned to unauthenticated remote callers. This information disclosure could aid in understanding authentication failures and may assist subsequent attac...