What is CVE-2026-40683?

CVE-2026-40683 is a high-severity vulnerability in Openstack Keystone, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.7/10. Published 2026-04-14.

How severe is CVE-2026-40683?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Openstack Keystone

CVE-2026-40683

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…

EPSS: 0.000 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H.

Affected products

Openstack Keystone — versions 8.0.0, 26.0.0, 27.0.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

bugs.launchpad.net/keystone/+bug/2121152
bugs.launchpad.net/keystone/+bug/2141713
review.opendev.org/958205
www.openwall.com/lists/oss-security/2026/04/14/9

Frequently asked questions

What is CVE-2026-40683?: CVE-2026-40683 is a high-severity vulnerability in Openstack Keystone, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.7/10. Published 2026-04-14.
How severe is CVE-2026-40683?: High severity. CVSS v3 base score is 7.7 out of 10.