CVE-2026-12388: A flaw was found in the Identity Provider (IdP) mapper component of Keycloak, which is used to manage how user information from external services is mapped to Keycloak users. An ad
A flaw was found in the Identity Provider (IdP) mapper component of Keycloak, which is used to manage how user information from external services is mapped to Keycloak users. An administrator with limited permissions to manage identity providers can exploit this flaw by creating a "Hardcoded Role" mapper that assigns high-level administrative roles (like realm-admin) to themselves or others. This allows a restricted administrator to bypass security checks and gain full control over the entire realm.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-12388
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-123880.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-12388 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Identity Provider
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-56666: ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external id…nvd · 2026-07-10
- mediumCVE-2026-56664: ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's …nvd · 2026-07-10
- mediumCVE-2026-55669: ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's …nvd · 2026-07-10
- mediumCVE-2026-14781: A flaw exists in the org.keycloak.broker.oidc package where the OIDC broker incorrectly synchr…nvd · 2026-07-05
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