Ceph
Ceph Object Gateway (RGW)
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 Ceph Object...
2026-08-28
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 Ceph Object Gateway (RGW) SigV4 handler does not reject requests that carry x-amz-* headers absent from the signed header set, allowing anyone holding a presigned URL to attach arbitrary unsigned x-amz-* headers that RGW will honor. AWS S3 requires every x-amz-* header on a SigV4 request to be signed and rejects requests bearing additional unsigned headers, but RGW validates only the headers listed in X-Amz-SignedHeaders and ignores any extra ones, so they take effect without being covered by the signature. By adding such headers to a presigned PUT URL, an attacker can grant themselves more capabilities than the URL's signer intended and escalate their privileges. This issue is fixed in versions 20.2.4 and 19.2.6.
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
---METADATA---
VENDOR: poweradmin
PRODUCT: poweradmin
AFFECTED_VERSIONS: Versions prior to 4.2.4 and 4.3.3
---END_METADATA---
Description Summary:
Poweradmin fails to validate the HTTP_HOST header, allowing unauthenticated attackers to poison redirect URIs and hijack user authentication tokens, leading to full account takeover.
Executive Summary:
An authentication bypass vulnerability in poweradmin allows unauthenticated attackers to hijack OIDC/SAML sessions and perform full account takeovers.
Vulnerability Details
CVE-ID: CVE-2026-54588
Affected Software: poweradmin poweradmin
Affected Versions: Versions prior to 4.2.4 and 4.3.3
Vulnerability: The application improperly trusts the
HTTP_HOSTrequest header when constructing callback URLs for OIDC and SAML flows. This allows an unauthenticated attacker to manipulate the authentication handshake and intercept sensitive authorization codes.Business Impact
This vulnerability carries a CVSS score of 9.6, reflecting the ease of exploit and the severity of the impact. Successful exploitation results in complete administrative account takeover, granting attackers full control over DNS administration and the ability to redirect traffic, exfiltrate sensitive data, or disable security services.
Remediation Plan
Immediate Action: Upgrade poweradmin to version 4.2.4, 4.3.3, or the latest available release to incorporate proper validation of redirect URIs.
Proactive Monitoring: Review authentication logs for unusual redirect patterns or attempts to access the application from unauthorized hosts.
Compensating Controls: Implement strict URL filtering on WAFs to ensure that
redirect_uriparameters in OIDC/SAML flows match expected, hardcoded domains.Exploitation Status
Public Exploit Available: No
Analyst Notes: As of Jun 23, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.
Analyst Recommendation
The severity of this flaw necessitates an immediate upgrade. Administrators must prioritize patching this vulnerability to prevent credential theft and unauthorized access to critical DNS management infrastructure.