---
id: CVE-2026-93856
title: >-
  In OpenStack Cinder through 29.0.0, cross-project information disclosure can
  occur in the Messages API
summary: >-
  In OpenStack Cinder through 29.0.0, cross-project information disclosure can
  occur in the Messages API. A non-admin user with the project-scoped 'member'
  or 'reader' role making the Block Storage API v3.3 "List messages" call finds
  the n…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-669
vendor: OpenStack
product: Cinder
affected:
  - Cinder >= 9.0.0 < 26.3.1
  - Cinder 27.0.0
  - Cinder 28.0.0
  - Cinder 29.0.0
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T06:16:23.459Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-93856'
references:
  - url: 'https://bugs.launchpad.net/cinder/+bug/2160671'
  - url: 'https://security.openstack.org/ossa/OSSA-2026-045.html'
  - url: 'https://www.openwall.com/lists/oss-security/2026/10/20/17'
tags:
  - cve.org
ingestedAt: '2026-10-21T06:42:48.172Z'
---

## Overview

In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. 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.

## Affected

- `Cinder >= 9.0.0 < 26.3.1`
- `Cinder 27.0.0`
- `Cinder 28.0.0`
- `Cinder 29.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.