Bug 2547693 (CVE-2026-93856)

Summary: CVE-2026-93856 cinder: openstack-cinder: Information disclosure via Block Storage API message listing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: eglynn, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in OpenStack Cinder. An authenticated user with project-level access can retrieve messages intended for other projects by issuing a message listing request to the Block Storage API. This flaw leads to information disclosure, exposing resource identifiers and status messages belonging to other tenants.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Deadline: 2026-10-20   

Description OSIDB Bzimport 2026-10-07 20:39:17 UTC 
A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage
API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects in addition to the user message about the other projects' resources (which, by
design, are sanitized generic messages). All Cinder deployments are affected.