Ceph Monitor subscription handler improperly authorizes config-key store reads, exposing cluster secrets to read-only users

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-50152
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 00:18:07 UTC
Updated2026-08-28 00:18:07 UTC
DescriptionCeph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the Monitor subscription handler fails to properly authorize access to the configuration-key store, allowing any CephX user with only  `mon allow r` capabilities to read the entire store by sending a single crafted MMonSubscribe message. The config-key store holds sensitive secrets including OSD LUKS disk-encryption passphrases and, on cephadm-managed clusters, the SSH private key that cephadm uses to reach every host in the cluster. Because that key grants root on every node under the default cephadm configuration, a low-privileged read-only account can escalate to full cluster and host compromise. This issue is fixed in versions 20.2.4 and 19.2.6

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Problem Types: CWE-285 | CWE-285 CWE-285: Improper Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ceph Ceph affected >= 19.0.0, < 19.2.6 Not specified
CNA Ceph Ceph affected >= 20.0.0, < 20.2.4 Not specified

References

ReferenceSourceLinkTags
github.com/ceph/ceph/commit/d971bb2b6199f70b1708a20a63fa944ee7a94727 [email protected] github.com
github.com/ceph/ceph/security/advisories/GHSA-rg9p-5xcp-wm8h [email protected] github.com
github.com/ceph/ceph/commit/f2840d2fd338ab5de2865f0f78684bbf7b888c84 [email protected] github.com
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