Auth bypass in Openstack Swift

CVE-2026-71191

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-…

Vulnerability class: Broken Access Control

Affected products

Weakness classification (CWE)

References