EUVD-2026-53049
GHSA-hqwm-h3rj-hvcf
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Presigned URL IS the server-side credential so PR:N; AC:L once URL is held; C:H only, no integrity or availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy from an arbitrary source object using the signer's authorization context. The attacker can read any object the signer has access to, provided the target project_id, container name, and object name are known. This affects all deployments using the default s3_acl=false configuration.
AnalysisAI
OpenStack Swift's S3API middleware through version 2.38.0 fails to enforce SigV4 signature coverage over semantic x-amz-* headers on presigned URL requests, enabling unauthorized server-side object copy operations under the signer's authorization context. An attacker holding a valid presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, redirecting Swift's behavior from a client upload into a server-side copy that reads any object accessible to the URL's original signer - effectively allowing privilege escalation within a delegated authorization context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the S3API middleware is actively enabled on the target OpenStack Swift deployment - this is an optional component not present in all Swift installations. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N) scores 6.0, capturing the high confidentiality impact offset by the specific prerequisite of holding a valid presigned PUT URL (AT:P). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the patch described in OpenStack Security Advisory OSSA-2026-030 (https://security.openstack.org/ossa/OSSA-2026-030.html); an exact fixed release version number was not confirmed in the available intelligence data and must be obtained directly from the advisory before upgrading. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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