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4.3
CVE-2026-93856PATCHED
openstack · cinder

CVE-2026-93856: In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user

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

VendorProductVersions
openstackcinder9.0.0, 27.0.0, 28.0.0, 29.0.0

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

Related News (1 articles)

Tier C
VulDB1d ago
CVE-2026-93856 | OpenStack Cinder up to 26.3.0/27.0.0/28.0.0/29.0.0 Messages API information disclosure
→ No new info (linked only)

Discussion (0)

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CVSS 3.14.3 MEDIUM
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA KEV❌ No
Actively exploited❌ No
Patch available
26.3.1
CWECWE-669
PublishedOct 21, 2026
Last enriched1d agov2
Trending Score27
Source articles1
Independent1
Info Completeness9/14
Missing: epss, kev, exploit, iocs, mitre_attack

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Verification

State: verified
Confidence: 100%

Vulnerability Timeline

CVE Published
Oct 21, 2026
Discovered by ZDM
Oct 21, 2026
Updated: affectedVersions
Oct 21, 2026
Patch Available
Oct 21, 2026

Version History

v2
Last enriched 1d ago
v2Tier C1d ago

Added affected version 26.3.0 to the list of vulnerable Cinder versions.

affectedVersions
via VulDB
v11d ago

Initial creation