Disclosure summary
Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation
Source-reported weakness categories
CWE-347
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2026-Aug
Open original source · Updated Sep 19, 2026
Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 8.1
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 ceph 18.2.2-12 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- Vendor guidance · build 18.2.2-13 · product IDs 20730-17084
- Vendor guidance · product IDs 20730-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-09-01T21:03:35-04:00
MODIFIED 2026-09-19T21:52:51-04:00
INGESTED 2026-10-08T12:35:14-04:00