Description
An issue was discovered in OpenStack Keystone 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can create EC2 credentials. By using a restricted application credential to call the EC2 credential creation API, an authenticated user with only a reader role may obtain an EC2/S3 credential that carries the full set of the parent user's S3 permissions, effectively bypassing the role restrictions imposed on the application credential. Only deployments that use restricted application credentials in combination with the EC2/S3 compatibility API (swift3 / s3api) are affected.
Affected products
openstack: keystone
References4
- security.openstack.org/ossa/OSSA-2026-005.html PatchVendor Advisory
- www.openwall.com/lists/oss-security/2026/04/07/12 Mailing ListPatchThird Party Advisory
- bugs.launchpad.net/keystone/+bug/2142138 ExploitIssue Tracking
- bugs.launchpad.net/keystone/+bug/2142138 ExploitIssue Tracking
Metrics
- CVSS 3.1
-
5.3
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 14 · as of 12 November 2026
- CWE
- CWE-863
Could this be exploited in your environment?
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