# CVE-2023-6291: Keycloak: redirect_uri validation bypass

> Attackers can bypass redirect_uri validation to steal access tokens and impersonate users in Keycloak deployments.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **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:** 26 Jan 2024
- **Updated:** 22 Sep 2026
- **Also known as:** GHSA-mpwq-j3xf-7m5w

## What is CVE-2023-6291?

CVE-2023-6291 is a high-severity vulnerability in Redhat Keycloak, published on 26 Jan 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 the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2023-6291?

2 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 7 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.keycloak:keycloak-services` | Maven | All versions | 23.0.3 |
| `org.keycloak:keycloak-services` | Maven | All versions | 23.0.3 |

Products: Redhat Keycloak, Redhat Migration Toolkit for Applications, Redhat Openshift Container Platform, Redhat Openshift Container Platform for Ibm Z, Redhat Openshift Container Platform for Linuxone, Redhat Openshift Container Platform for Power, Redhat Single Sign-On.

## How do I fix CVE-2023-6291?

Upgrade org.keycloak:keycloak-services to 23.0.3 or later.

## Is CVE-2023-6291 being exploited?

There is no known exploitation of CVE-2023-6291 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Keycloak

- [CVE-2022-4361](https://insights.sbomify.com/CVE-2022-4361/): Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC (critical 10.0)
- [CVE-2022-1245](https://insights.sbomify.com/CVE-2022-1245/): Keycloak vulnerable to privilege escalation on Token Exchange feature (critical 9.8)
- [CVE-2021-20195](https://insights.sbomify.com/CVE-2021-20195/): keycloak Self Stored Cross-site Scripting vulnerability (critical 9.6)
- [CVE-2019-14910](https://insights.sbomify.com/CVE-2019-14910/): Keycloak Authentication Error (critical 9.3)
- [CVE-2019-14909](https://insights.sbomify.com/CVE-2019-14909/): Keycloak Authentication Error (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6291 and fix it if it is affected.

What it is: CVE-2023-6291 is a high-severity vulnerability in Redhat Keycloak, published on 26 Jan 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-2023-6291 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 23.0.3
- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 23.0.3

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-2023-6291/ (Markdown: https://insights.sbomify.com/CVE-2023-6291/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6291
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6291
- OSV: https://osv.dev/vulnerability/CVE-2023-6291

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6291/
Summaries are generated and may contain mistakes; the official description above is the record.