Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation
Description
CVE-2026-54330 is a vulnerability in the Ceph RGW SigV4 handler where it accepts unsigned x-amz-* headers on presigned requests. This behavior can lead to privilege escalation. The affected product version is Microsoft Ceph RGW 3.0. No CVSS score is provided, and there are no known exploits in the wild. No patch or remediation details are currently available.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Ceph RGW SigV4 handler in Microsoft Ceph RGW version 3.0 improperly accepts unsigned x-amz-* headers on presigned requests. This flaw corresponds to CWE-347 (Improper Verification of Cryptographic Signature) and allows an attacker to escalate privileges by exploiting the acceptance of unsigned headers that should be verified. The vulnerability was cataloged as CVE-2026-54330 by the Microsoft Security Response Center. There is no CVSS score or patch information provided at this time.
Potential Impact
An attacker can exploit this vulnerability to escalate privileges by sending presigned requests with unsigned x-amz-* headers that the SigV4 handler incorrectly accepts. This could allow unauthorized actions or access within the affected Ceph RGW service.
Mitigation Recommendations
Patch status is not yet confirmed — check the Microsoft Security Response Center advisory for current remediation guidance. No official fix or workaround information is provided in the available data.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-54330
- Cve Count
- 1
Threat ID: 6a984565acd9273b496ac9fe
Added to database: 09/02/2026, 15:48:53 UTC
Last enriched: 09/07/2026, 22:23:47 UTC
Last updated: 10/17/2026, 06:48:18 UTC
Views: 36
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