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TI-2026-78583 Aliases CVE-2026-93856GHSA-rgvg-xc9j-2jxv

Cross-project information disclosure in OpenStack Cinder Messages API

Priority MEDIUM 53CWE-669Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

OpenStack Cinder from 9.0.0 before 26.3.1 and 27.0.0 through 29.0.0 are affected. The Messages API discloses information across projects (CWE-669), exposing UUIDs of other projects' resources along with their user messages. A non-admin user with the project-scoped member or reader role sees non-expired user messages of other projects in the Block Storage API v3.3 List messages response.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00374 31st percentileScored 2026-11-07
Fix Partial Cinder (OpenStack): 26.3.1Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenStackCinder9.0.0 to before 26.3.1; 27.0.0; 28.0.0; 29.0.026.3.1Patch availableCNA
  • Cinder VendorOpenStack Affected 9.0.0 to before 26.3.1; 27.0.0; 28.0.0; 29.0.0 Fixed in 26.3.1 Patch available CNA

Remediation

Upgrade OpenStack Cinder to 26.3.1. Red Hat OpenStack Platform 13 (Queens), 16.2, 17.1 and 18.0 are affected, and Red Hat lists no plan available for them.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Cinder (OpenStack) Fixed in 26.3.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 16.2AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 17.1AffectedNo fix yet: Fix deferred
Red Hat OpenStack Platform 18.0AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-93856
  2. 2026-10-21 Affected versions changed · Red Hat
  3. 2026-10-21 CVSS score added · Red Hat
  4. 2026-10-21 Alias added: GHSA-rgvg-xc9j-2jxv
  5. 2026-10-21 CISA SSVC decision points changed
  6. 2026-10-21 Priority changed: LOW → MEDIUM

References

Other 3

  • TI-2026-78562 Incorrect authorization in OpenStack Manila share operations CVSS 3.1CRITICAL 9.9
  • TI-2026-63467 Code injection in OpenStack Octavia CVSS 4.0CRITICAL 9.4
  • TI-2017-13226 The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before… CVSS 3.1CRITICAL 9.8
  • TI-2026-69629 OpenStack Mistral flaw lets users change other projects' resources CVSS 4.0HIGH 7.2
  • TI-2026-69623 Command injection in OpenStack Mistral std.ssh_proxied action CVSS 4.0HIGH 8.7
  • TI-2022-17779 Improper privilege management in OpenStack CVSS 3.1HIGH 8.8
See all 332 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences