Spring Security Advisories

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Spring gRPC AuthenticationException message reflected to remote client

LOW | APRIL 28, 2026 | CVE-2026-40969

Description

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 Spring Products and Versions

Spring gRPC:

  • 1.0.2 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
1.0.3OSS

No further mitigation steps are necessary.

References

History

  • 2026-04-28: Initial vulnerability report published.

Reporting a vulnerability

To report a security vulnerability for a project within the Spring portfolio, see the Security Policy

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