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Learn moreCVE-2026-40969: Spring gRPC AuthenticationException message reflected to remote client
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:
- 1.0.0 - 1.0.2
- Older, unsupported versions are also affected.
Mitigation
Users of affected versions should upgrade to the corresponding fixed version.
| Affected version(s) | Fix version | Availability |
|---|---|---|
| 1.0.x | 1.0.3 | OSS |
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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