What’s Vulnerable › Vulnerabilities

CVE-2026-93856

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-22
• Weakness: CWE-669

Description

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 products

• OpenStack Cinder: from 9.0.0 before 26.3.1; 27.0.0, 28.0.0, 29.0.0 — fixed in 26.3.1

How to fix

Upgrade to a fixed version: OpenStack Cinder 26.3.1. Check the vendor advisory for mitigations.

References

• https://bugs.launchpad.net/cinder/+bug/2160671
• https://security.openstack.org/ossa/OSSA-2026-045.html
• https://www.openwall.com/lists/oss-security/2026/10/20/17
• http://www.openwall.com/lists/oss-security/2026/10/20/17
• https://bugs.launchpad.net/cinder/+bug/2160671

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