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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: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Spring Vmware
Products
Spring Spring Grpc
CVE-2026-40968

Spring gRPC SecurityContext leaks across requests on authorization failure

When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions. Affected versions: Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Spring Vmware
Products
Spring Spring Grpc