5.3

CVE-2026-33551: openstack keystone Incorrect Authorization

Analyzed
AliasesGHSA-4phw-6824-6cfpPYSEC-2026-202UBUNTU-CVE-2026-33551
Published 10-04-2026Last modified 10-04-2026

Vulnerability summary

CVE-2026-33551 is a medium (CVSS 5.3) Incorrect Authorization vulnerability in openstack keystone. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.5% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 3.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.22%
0%100%
Low · -0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
RHSA-2026:28044RHSA-2026:39808RHSA-2026:54757USN-8433-1

Timeline

  1. 10-04-2026
    PublishedVulnerability first disclosed.
  2. 10-04-2026
    Last modifiedVulnerability 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

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

Decrease -0.11 pp

From 0.33% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugs.launchpad.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • keystone< 2:22.0.2-0+deb12u2 | < 2:27.0.0-3+deb13u3 | < 2:29.0.0-2
Openstack1 product
  • keystone≥ 14.0.0, < 26.1.1 | 27.0.0 | 28.0.0 | 29.0.0
PyPI1 product
  • keystone≥ 14.0.0, < 26.1.1
Ubuntu1 product
  • keystoneAll versions (No fix recorded) | < 2:21.0.1-0ubuntu2.4 | < 2:25.0.0-0ubuntu1.4 | < 2:28.0.0-0ubuntu1.3 | < 2:29.0.0-0ubuntu1.2

4 vendors · 4 products

References

13 links
Show all 13 references