CVE-2023-6291Network attack vector

Access-token theft via decoded redirect URI validation

Published Jan 26, 2024 · Updated Nov 11, 2025

Open redirect in Keycloak before 22.0.7 allows remote attackers to steal access tokens through a crafted redirect_uri value. The verifyRedirectUri path validates a URL-decoded value, so encoded delimiters make Keycloak and browsers disagree about the authority. Exploitation requires user interaction in an OAuth flow and redirects the resulting token to an attacker-controlled host, enabling user impersonation.

CVSS severity7.1
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Keycloak before 22.0.7 allows remote attackers to steal access tokens through a crafted redirect_uri value. The verifyRedirectUri path validates a URL-decoded value, so encoded delimiters make Keycloak and browsers disagree about the authority. Exploitation requires user interaction in an OAuth flow and redirects the resulting token to an attacker-controlled host, enabling user impersonation.

The record

CVE
CVE-2023-6291
Published
Jan 26, 2024
Updated
Nov 11, 2025
Vendor
Red Hat
Product
RHEL-8 based Middleware Containers
Classifications
CWE-601, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · RHEL-8 based Middleware ContainersAffected versions are unavailable in this record.
Red Hat · Migration Toolkit for Applications 6Affected versions are unavailable in this record.
Red Hat · Red Hat build of Keycloak 22Affected versions are unavailable in this record.
Red Hat · Red Hat Single Sign-OnAffected versions are unavailable in this record.

Published CVSS scores

7.1Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1528Steal Application Access Token

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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