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Fencer Vulns
medium 4.3

CVE-2026-93856 json

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

published 2026-10-21 19 d ago modified 2026-10-22 18 d ago also EUVD-2026-107047

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • OpenStack Cinder 26.3.1
  • cinder Debian 14 2:29.0.0-3

debian advisories DEBIAN-CVE-2026-93856

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93856 updated cvss 4.3

cinder: openstack-cinder: Information disclosure via Block Storage API message listing

  • Red Hat OpenStack Platform 13 (Queens) python-cinder, openstack-cinder Red Hat OpenStack Platform 16.2 python3-cinder, openstack-cinder Red Hat OpenStack Platform 17.1 python3-cinder, openstack-cinder, python3-cinder-common Red Hat OpenStack Platform 18.0 openstack-cinder
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 d ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/cinder/+bug/2160671 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

  • OpenStack Cinder

Classification

Weakness
  • CWE-669 Incorrect Resource Transfer Between Spheres

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.