Spring gRPC SecurityContext leaks across requests on authorization failure

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Summary

CVECVE-2026-40968
StatePUBLISHED
Assignervmware
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-28 15:16:30 UTC
Updated2026-04-30 13:32:58 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.000310000 probability, percentile 0.086990000 (date 2026-05-03)

Problem Types: CWE-653 | CWE-653 CWE-653: Improper Isolation or Compartmentalization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Vmware Spring Grpc All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Spring Spring GRPC affected 1.0.0 1.0.3 custom Not specified

References

ReferenceSourceLinkTags
spring.io/security/cve-2026-40968 [email protected] spring.io Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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