4.3 Medium

CVE-2026-93856 In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API

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 and versions

Product	Affected versions	Fixed in
Cinder	29.0.0	No fix stated
Cinder	28.0.0	No fix stated
Cinder	27.0.0	No fix stated
Cinder 9.0	9.0.0 → < 26.3.1	26.3.1

References

bugs.launchpad.net bugs.launchpad.net
security.openstack.org security.openstack.org
www.openwall.com www.openwall.com

Timeline

Published October 21, 2026
Last modified October 21, 2026

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