How severe is CVE-2026-33551?

CVE-2026-33551 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-33551 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33551?

CVE-2026-33551 primarily affects Openstack Keystone. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-33551?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33551 have an EU (EUVD) identifier?

Yes. CVE-2026-33551 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21278.

When was CVE-2026-33551 published?

CVE-2026-33551 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-33551

CVE-2026-33551 is a low-severity vulnerability in Openstack Keystone with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21278
Weakness: CWE-863
Affected product: Openstack Keystone
Published: 2026-04-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33551?: 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.
How severe is CVE-2026-33551?: CVE-2026-33551 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-33551 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33551?: CVE-2026-33551 primarily affects Openstack Keystone. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-33551?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33551 have an EU (EUVD) identifier?: Yes. CVE-2026-33551 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21278.
When was CVE-2026-33551 published?: CVE-2026-33551 was published on 2026-04-10 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*
cpe:2.3:a:openstack:keystone:27.0.0:*:*:*:*:*:*:*
cpe:2.3:a:openstack:keystone:28.0.0:*:*:*:*:*:*:*
cpe:2.3:a:openstack:keystone:29.0.0:*:*:*:*:*:*:*

More vulnerabilities in Openstack Keystone

CVE-2020-12691 — High (CVSS 8.8): An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. Any authenticated user can create an EC2…
CVE-2020-12690 — High (CVSS 8.8): An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The list of roles provided for an OAuth1…
CVE-2020-12689 — High (CVSS 8.8): An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. Any user authenticated within a limited scope…
CVE-2019-19687 — High (CVSS 8.8): OpenStack Keystone 15.0.0 and 16.0.0 is affected by Data Leakage in the list credentials API. Any user with a role on a…
CVE-2026-43001 — High (CVSS 7.9): An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the…
CVE-2014-2828 — High (CVSS 7.8): The V3 API in OpenStack Identity (Keystone) 2013.1 before 2013.2.4 and icehouse before icehouse-rc2 allows remote…

All CVEs affecting Openstack Keystone →

Other CWE-863 (Incorrect Authorization) vulnerabilities

CVE-2026-48286 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9396 and earlier are affected by an Incorrect Authorization…
CVE-2026-48303 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9394 and earlier are affected by an Incorrect Authorization…
CVE-2026-44330 — Critical (CVSS 10.0): free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the…
CVE-2026-46595 — Critical (CVSS 10.0): Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of…
CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
CVE-2026-32213 — Critical (CVSS 10.0): Improper authorization in Azure AI Foundry allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-863 (Incorrect Authorization) vulnerabilities →