CVE-2026-40969

Spring gRPC AuthenticationException message reflected to remote client

Published Apr 28, 2026 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
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 versions:
Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-37w2-q6vh-45v6 Spring gRPC AuthenticationException messages are reflected to remote client
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Vmware
Vmware spring Grpc
CPEs cpe:2.3:a:vmware:spring_grpc:*:*:*:*:*:*:*:*
Vendors & Products Vmware
Vmware spring Grpc
Type Values Removed Values Added
First Time appeared Spring
Spring spring
Vendors & Products Spring
Spring spring
Type Values Removed Values Added
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 versions: Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.
Title Spring gRPC AuthenticationException message reflected to remote client
Weaknesses CWE-209
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
vmware
Published
Updated
Apr 28, 2026, 5:21 PM
Reserved
Apr 16, 2026, 2:18 AM
Status
Analyzed
Published
Apr 28, 2026, 3:16 PM
Modified
Oct 26, 2026, 12:10 AM