CVE-2026-40683

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Summary

CVECVE-2026-40683
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-14 20:16:48 UTC
Updated2026-04-14 21:16:26 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H

Problem Types: CWE-843 | CWE-843 CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
3.1CNACVSS7.7HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenStack Keystone affected 8.0.0 25.0.1 semver Not specified
CNA OpenStack Keystone affected 26.0.0 26.1.1 semver Not specified
CNA OpenStack Keystone affected 27.0.0 27.0.1 semver Not specified
CNA OpenStack Keystone affected 28.0.0 28.0.1 semver Not specified

References

ReferenceSourceLinkTags
bugs.launchpad.net/keystone/+bug/2141713 [email protected] bugs.launchpad.net
bugs.launchpad.net/keystone/+bug/2121152 [email protected] bugs.launchpad.net
www.openwall.com/lists/oss-security/2026/04/14/9 [email protected] www.openwall.com
review.opendev.org/958205 [email protected] review.opendev.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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