CVE-2026-40968

FAUCET Score

When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions. 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

4.2MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

Exploitability Score

1.6

Impact Score

2.5

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.17%

Probability of exploitation in next 30 days

EPSS Percentile

6.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0017 is in the 0th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 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-4g9c-3x4p-mfppmedium

Spring gRPC SecurityContext leaks across requests upon authorization failure

Apr 28, 2026

References

spring.io / security/cve-2026-40968

Vendor Advisory