# CVE-2024-1249: Keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkloginiframe leads to ddos

> Attackers can cause denial of service in Keycloak by sending unvalidated cross-origin messages to the checkLoginIframe endpoint.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 17 Apr 2024
- **Updated:** 27 Oct 2026
- **Also known as:** GHSA-m6q9-p373-g5q8

## What is CVE-2024-1249?

CVE-2024-1249 is a high-severity denial of service vulnerability in Red Hat Migration Toolkit for Applications 6, published on 17 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A flaw was found in Keycloak's OIDC component in the "checkLoginIframe," which allows unvalidated cross-origin messages. This flaw allows attackers to coordinate and send millions of requests in seconds using simple code, significantly impacting the application's availability without proper origin validation for incoming messages.

Weakness: CWE-346 (Origin Validation Error)

## Which versions are affected by CVE-2024-1249?

4 open source packages ship an affected version, including org.keycloak:keycloak-services.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.keycloak:keycloak-services` | Maven | All versions | 22.0.10 |
| `org.keycloak:keycloak-services` | Maven | All versions | 22.0.10 |
| `org.keycloak:keycloak-services` | Maven | From 23.0.0 | 24.0.3 |
| `org.keycloak:keycloak-services` | Maven | From 23.0.0 | 24.0.3 |

## How do I fix CVE-2024-1249?

Upgrade org.keycloak:keycloak-services to a fixed version for your release line: 22.0.10 or 24.0.3.

## Is CVE-2024-1249 being exploited?

There is no known exploitation of CVE-2024-1249 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-1249 and fix it if it is affected.

What it is: CVE-2024-1249 is a high-severity denial of service vulnerability in Red Hat Migration Toolkit for Applications 6, published on 17 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-1249 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 22.0.10
- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 22.0.10
- org.keycloak:keycloak-services (Maven): affected from 23.0.0; fixed in 24.0.3
- org.keycloak:keycloak-services (Maven): affected from 23.0.0; fixed in 24.0.3

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-2024-1249/ (Markdown: https://insights.sbomify.com/CVE-2024-1249/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-1249
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-1249
- OSV: https://osv.dev/vulnerability/CVE-2024-1249

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-1249/
Summaries are generated and may contain mistakes; the official description above is the record.