# CVE-2026-12388: Privilege escalation in Red Hat Build of Keycloak

> Restricted administrators can escalate privileges to realm administrator by exploiting improper authorization in the identity provider mapper.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jun 2026
- **Updated:** 30 Jun 2026
- **Also known as:** GHSA-jxqv-2jjx-692h

## What is CVE-2026-12388?

CVE-2026-12388 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 30 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

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.

Weakness: CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-12388?

It affects 1 product.


Products: Redhat Build of Keycloak.

## How do I fix CVE-2026-12388?

No fix has been published for CVE-2026-12388 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12388 being exploited?

There is no known exploitation of CVE-2026-12388 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Build of Keycloak

- [CVE-2026-15572](https://insights.sbomify.com/CVE-2026-15572/): Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation (high 8.8)
- [CVE-2026-3047](https://insights.sbomify.com/CVE-2026-3047/): Keycloak SAML Broken has Authentication Bypass by Primary Weakness (high 8.8)
- [CVE-2026-15573](https://insights.sbomify.com/CVE-2026-15573/): Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher (high 8.1)
- [CVE-2026-16102](https://insights.sbomify.com/CVE-2026-16102/): Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers (high 8.1)
- [CVE-2026-1609](https://insights.sbomify.com/CVE-2026-1609/): Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12388 and fix it if it is affected.

What it is: CVE-2026-12388 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 30 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12388 in the wild and no public exploit code.

Affected product: Redhat Build of Keycloak. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-12388/ (Markdown: https://insights.sbomify.com/CVE-2026-12388/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12388
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12388
- OSV: https://osv.dev/vulnerability/CVE-2026-12388

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12388/
Summaries are generated and may contain mistakes; the official description above is the record.