CVE-2026-406837.7HighCWE-843

CVE-2026-40683: OpenStack Keystone vulnerability

OpenStack · Keystone

Fixed in 28.0.1 · Affected: OpenStack Keystone before 28.0.1 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.3%probability of exploitation in the next 30 days

28th percentile

050100

Higher than 28% of scored CVEs

7.7HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

In OpenStack Keystone before 28.0.1, the LDAP identity backend does not convert the user enabled attribute to a boolean when the user_enabled_invert configuration option is False (the default). The _ldap_res_to_model method in the UserApi class only performed string-to-boolean conversion when user_enabled_invert was True. When False, the raw string value from LDAP (e.g., "FALSE") was used directly. Since non-empty strings are truthy in Python, users marked as disabled in LDAP were treated as enabled by Keystone, allowing them to authenticate and perform actions. All deployments using the LDAP identity backend without user_enabled_invert=True or user_enabled_emulation are affected.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

OpenStack · Keystonefrom 8.0.0 before 25.0.1; from 26.0.0 before 26.1.1; from 27.0.0 before 27.0.1; from 28.0.0 before 28.0.1

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Type Confusion · Memory Corruption
Vendor: OpenStack
Published: April 2026
Band: Unlikely (under 1%), April 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-40683 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.