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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["Block Storage API version 3.3"], "product": "Cinder", "repo": "https://opendev.org/openstack/cinder", "vendor": "OpenStack", "versions": [{"lessThan": "26.3.1", "status": "affected", "version": "9.0.0", "versionType": "semver"}, {"status": "affected", "version": "27.0.0", "versionType": "semver"}, {"status": "affected", "version": "28.0.0", "versionType": "semver"}, {"status": "affected", "version": "29.0.0", "versionType": "semver"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-93856", "lastModified": "2026-10-21T06:16:51.017", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-10-21T06:16:51.017", "references": [{"source": "cve@mitre.org", "url": "https://bugs.launchpad.net/cinder/+bug/2160671"}, {"source": "cve@mitre.org", "url": "https://security.openstack.org/ossa/OSSA-2026-045.html"}, {"source": "cve@mitre.org", "url": "https://www.openwall.com/lists/oss-security/2026/10/20/17"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-669"}], "source": "cve@mitre.org", "type": "Primary"}]}

{"bugzilla": {"description": "cinder: openstack-cinder: Information disclosure via Block Storage API message listing", "id": "2547693", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547693"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-201", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Operators can shorten how long these messages remain available by lowering the Cinder message_ttl option. The default is 2592000 seconds (30 days). A periodic task removes expired messages. That task runs on the message_reap_interval, which defaults to 86400 seconds (24 hours). This reduces the window during which another project's error messages can be listed. It does not prevent the list API from returning messages that have not yet expired."}, "name": "CVE-2026-93856", "package_state": [{"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Fix deferred", "package_name": "openstack-cinder", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Fix deferred", "package_name": "openstack-cinder", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Fix deferred", "package_name": "openstack-cinder", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Fix deferred", "package_name": "openstack-cinder", "product_name": "Red Hat OpenStack Platform 18.0"}], "public_date": "2026-10-20T14:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93856\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93856"], "statement": "This vulnerability is rated as having Moderate impact by Red Hat because an authenticated user with project-level access can list Cinder user messages that belong to other projects. The response contains predefined, sanitized error text and resource identifiers. It does not include the owning project ID, so the caller cannot tell which project a resource identifier belongs to. Cinder records these messages for errors, not for successful operations. The issue does not expose volume contents and does not allow modification or deletion of other tenants' resources.", "threat_severity": "Moderate"}

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