Auth bypass in Defenseunicorns Uds-Identity-Config
CVE-2026-46389
UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS Core's Identity deployment. In versions 0.11.0 through 0.26.0, a logic error in the `client-kubernetes-secret` Keycloak client authenticator (shipped by `uds-identity-config` and consumed by UDS Core) causes the submitted `client_secret` to be overwritten with the mounted Kubernetes secret before comparison. An attacker who can reach the Keycloak token endpoint and knows a `client_id` using this authenticator can authenticate as that client with any `client_secret` value and obtain OAuth2 tokens scoped to the client's service account. In the case of the `uds-operator` client this token can be used to registry/modify other clients. Version 0.26.1 patches the issue.
Vulnerability class: Broken Authentication
EPSS: 0.003 (26.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Defenseunicorns Uds-identity-config — versions >= 0.11.0, < 0.26.1
- Defenseunicorns Uds_identity_config
Weakness classification (CWE)
References
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-46389?
- CVE-2026-46389 is a critical-severity vulnerability in Defenseunicorns Uds-Identity-Config, classified under Improper Authentication. CVSS score: 10.0/10. Published 2026-06-05.
- How severe is CVE-2026-46389?
- Critical severity. CVSS v3 base score is 10.0 out of 10.