CVE-2026-40968

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.

More information : https://spring.io/security/cve-2026-40968