CVE-2023-6291

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.

What this means for your business

It affects Redhat Keycloak. It matters if your company, or a supplier that handles your data, runs it.
An attacker can use it remotely, over a network, without a login, but only after tricking someone into an action such as opening a file or a link.
FIRST's prediction model gives it a 0.9% chance of attack attempts being seen in the next 30 days, ranking above 59% of all known flaws.

What to do

1Check whether your company or your suppliers run Redhat Keycloak, and which version. The affected versions are listed further down this page.
2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS: 7.1 (v3.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Weakness: CWE-601
Assigned by: secalert@redhat.com

Dates

Published: 2024-01-26
Last modified: 2026-09-22
Sources: NVD

Affected products

Redhat Keycloak- 22.0.7
Redhat Single Sign-Onall versions, 7.6
Redhat Openshift Container Platform4.11, 4.12
Redhat Openshift Container Platform For Ibm Z4.9, 4.10
Redhat Openshift Container Platform For Linuxone4.9, 4.10
Redhat Openshift Container Platform For Power4.9, 4.10
Redhat Enterprise Linux8.0, 7.0, 9.0
Redhat Migration Toolkit For Applications6.0, 7.0

As listed in the NVD configuration data. Not a statement about your estate.