CVE-2026-33551
Description
A flaw was found in OpenStack Keystone. An authenticated user with a reader role can exploit a vulnerability in the EC2 credential creation endpoint. By using a restricted application credential to call the EC2 credential creation API, the user may obtain EC2/S3 credentials that carry the full set of the parent user's S3 permissions. This effectively bypasses the role restrictions imposed on the application credential, leading to unauthorized access and privilege escalation. This issue affects deployments that use restricted application credentials in combination with the EC2/S3 compatibility API.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.5 | 5.3 | 3.5 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | High |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Changed | Unchanged | Changed |
| Confidentiality | None | High | None |
| Integrity Impact | Low | None | Low |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
NVD: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity
A user can access restricted functionality and/or sensitive information that may include administrative functionality and user accounts.
Acknowledgements
Red Hat would like to thank Maxence Bornecque (Orange Cyberdefense CERT Vulnerability Intelligence Watch Team) for reporting this issue.
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