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CVE

CVE-2026-40683

CVE-2026-40683 keystone
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CVE

CVE-2026-40683

CVE-2026-40683 keystone

In OpenStack Keystone before 28.0.1, the LDAP identity backend does not convert the user enabled attribute to a boolean when the userenabledinvert configuration option is False (the default). The ldaprestomodel method in the UserApi class only performed string-to-boolean conversion when userenabledinvert 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 userenabledinvert=True or userenabledemulation are affected.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.7
-
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40683

Severity

7.7

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.7
EPSS Probability
0.00021%
EPSS Percentile
0.06089%
Introduced Version
0
Fix Available
2:22.0.2-0+deb12u2,2:18.1.0-1+deb11u3,2:27.0.0-3+deb13u3,0

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