CVE-2023-6291 | Keycloak: redirect_uri validation bypass

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.

Published: 2024-01-26 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-6291 is rated Moderate Risk (48.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.95%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-6291

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.20% 0.95% +0.75%
2 2025-11-21 0.60% 0.20% -0.40%
3 2025-11-18 — 0.60% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-6291

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 3.7 [email protected]
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 3.7 [email protected]

Weakness enumeration for CVE-2023-6291

GitHub Security Advisory for CVE-2023-6291

GHSA-mpwq-j3xf-7m5w · Severity: high · Ecosystem: maven — The redirect_uri validation logic allows for bypassing explicitly allowed hosts that would otherwise be restricted

OS Trackers for CVE-2023-6291

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2023-6291

Affected software / configurations for CVE-2023-6291

Vendor Product Version Raw CPE
redhat keycloak < 22.0.7 cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
redhat single_sign-on — cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:*
redhat openshift_container_platform 4.11 cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:*:*
redhat openshift_container_platform 4.12 cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:*
redhat openshift_container_platform_for_ibm_z 4.9 cpe:2.3:a:redhat:openshift_container_platform_for_ibm_z:4.9:*:*:*:*:*:*:*
redhat openshift_container_platform_for_ibm_z 4.10 cpe:2.3:a:redhat:openshift_container_platform_for_ibm_z:4.10:*:*:*:*:*:*:*
redhat openshift_container_platform_for_linuxone 4.9 cpe:2.3:a:redhat:openshift_container_platform_for_linuxone:4.9:*:*:*:*:*:*:*
redhat openshift_container_platform_for_linuxone 4.10 cpe:2.3:a:redhat:openshift_container_platform_for_linuxone:4.10:*:*:*:*:*:*:*
redhat openshift_container_platform_for_power 4.9 cpe:2.3:a:redhat:openshift_container_platform_for_power:4.9:*:*:*:*:*:*:*
redhat openshift_container_platform_for_power 4.10 cpe:2.3:a:redhat:openshift_container_platform_for_power:4.10:*:*:*:*:*:*:*
redhat single_sign-on 7.6 cpe:2.3:a:redhat:single_sign-on:7.6:*:*:*:*:*:*:*
redhat migration_toolkit_for_applications 6.0 cpe:2.3:a:redhat:migration_toolkit_for_applications:6.0:*:*:*:*:*:*:*
redhat migration_toolkit_for_applications 7.0 cpe:2.3:a:redhat:migration_toolkit_for_applications:7.0:*:*:*:*:*:*:*

References for CVE-2023-6291

URL Tags
https://access.redhat.com/errata/RHSA-2023:7854 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:7855 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:7856 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:7857 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:7858 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:7860 Vendor Advisory
https://access.redhat.com/errata/RHSA-2023:7861 Vendor Advisory
https://access.redhat.com/errata/RHSA-2024:0798
https://access.redhat.com/errata/RHSA-2024:0799
https://access.redhat.com/errata/RHSA-2024:0800
https://access.redhat.com/errata/RHSA-2024:0801
https://access.redhat.com/errata/RHSA-2024:0804
https://access.redhat.com/security/cve/CVE-2023-6291 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2251407 Issue Tracking Vendor Advisory
cvelogic Threat Intelligence