CVE-2026-93856 In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-93856?
CVE-2026-93856 is a medium-severity vulnerability in OpenStack Cinder, published on 21 Oct 2026.
Official 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.
Weakness: CWE-669
Which versions are affected by CVE-2026-93856?
How do I fix CVE-2026-93856?
No fix has been published for CVE-2026-93856 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93856 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93856 exists.
Sources
Also known as DEBIAN-CVE-2026-93856, GHSA-rgvg-xc9j-2jxv, UBUNTU-CVE-2026-93856.