attacker can inject these headers into a signed PUT request targeting their own bucket, causing Swift to perform a server-side copy from another tenant's private object. The source object authorization is bypassed because the S3API middleware has already authorized the request against the destination. The attacker can read any object whose project_id, container name, and object name are known, regardless of the source object's ACLs or ownership. This requires the non-default s3_acl=true configuration.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OpenStack | Swift | unaffected |
|
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Solution
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Wed, 05 Aug 2026 06:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | S3API Middleware Allows Unauthorized Server‑Side Copy in OpenStack Swift |
Wed, 05 Aug 2026 05:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In OpenStack Swift through 2.38.0, the S3API middleware does not sanitize Swift-native control headers (X-Copy-From, X-Copy-From-Account) from S3 API requests when s3_acl=true. An attacker can inject these headers into a signed PUT request targeting their own bucket, causing Swift to perform a server-side copy from another tenant's private object. The source object authorization is bypassed because the S3API middleware has already authorized the request against the destination. The attacker can read any object whose project_id, container name, and object name are known, regardless of the source object's ACLs or ownership. This requires the non-default s3_acl=true configuration. | |
| First Time appeared |
Openstack
Openstack swift |
|
| Weaknesses | CWE-863 | |
| CPEs | cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Openstack
Openstack swift |
|
| References |
| |
| Metrics |
cvssV4_0
|
Projects
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MITRE
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2026-08-05T05:05:33.267Z
Reserved: 2026-08-05T05:05:32.904Z
Link: CVE-2026-71192
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-08-05T06:30:03Z