Vulnerability · Published Apr 28, 2026 · Assigned by vmware

CVE-2026-40969Spring gRPC AuthenticationException message reflected to remote client

Low 3.7

In plain English

A low-severity security flaw in Spring gRPC from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.2%top 90.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	org.springframework.grpc:spring-grpc	1.0.3	GHSA-37w2-q6vh-45v6

Affected products (as reported)

Vendor	Product	Versions
Spring	Spring gRPC	1.0.0 – before 1.0.3

Weakness: CWE-209 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://spring.io/security/cve-2026-40969