CVE-2026-33551

Aliases:GHSA-4phw-6824-6cfpPYSEC-2026-202
Advisory lineage Upstream: 0 Downstream: 5
Analyzed
Published: 10 Apr 2026, 00:00
Last modified:10 Apr 2026, 13:50

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
5.3 MEDIUM
v3.1 (nvd)
EPSS Score
0.22% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

10 Apr 2026, 00:00
Published
Vulnerability first disclosed
10 Apr 2026, 13:50
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•LOW•Score: 3.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Trends

Current EPSS score: 0.22%• Percentile: 12%

Techniques & Countermeasures

  • CWE-863•Incorrect Authorization

    The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Affected Systems

  • openstack•keystone

    ≥ 14.0.0, < 26.1.1 | 27.0.0 | 28.0.0 | 29.0.0

  • PyPI•keystone

    ≥ 14.0.0, < 26.1.1

References (7)