Vulnerability details
CVE-2026-50152
Ceph Monitor subscription handler improperly authorizes config-key store reads, exposing cluster secrets to read-only users
Official description
Ceph 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
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| ceph | ceph | >= 19.0.0, < 19.2.6 | CVEProject cvelistV5 (CNA) |
| ceph | ceph | >= 20.0.0, < 20.2.4 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/ceph/ceph/security/advisories/GHSA-rg9p-5xcp-wm8h x_refsource_CONFIRM
- https://github.com/ceph/ceph/commit/d971bb2b6199f70b1708a20a63fa944ee7a94727 x_refsource_MISC
- https://github.com/ceph/ceph/commit/f2840d2fd338ab5de2865f0f78684bbf7b888c84 x_refsource_MISC
Details
- Published
- 2026-08-28
- Last updated
- 2026-09-01
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-285Improper Authorization