CVE-2026-40969

FAUCET Score

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.

First published: Apr 28, 2026Last modified: Apr 28, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 1.0.3CPE matchmatch criteria	cpe:2.3:a:vmware:spring_grpc::::::::

CVSS Data

CVSS version used by this source: 3.1

3.7LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

Exploitability Score

2.2

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.20%

Probability of exploitation in next 30 days

EPSS Percentile

10.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-26

Model: v2026.06.15

This CVE's current EPSS score of 0.0020 is in the 2nd percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa

Product: org.springframework.grpc:spring-grpcFixed in: 1.0.3

Vendor Advisories (1)

mavenGHSA-37w2-q6vh-45v6low

Spring gRPC AuthenticationException messages are reflected to remote client

Apr 28, 2026

References

spring.io / security/cve-2026-40969

Vendor Advisory