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Fencer Vulns
medium 4.6

CVE-2023-6134 json

Keycloak: reflected xss via wildcard in oidc redirect_uri

published 2023-12-14 2 y ago modified 2026-09-22 48 d ago also GHSA-cvg2-7c3j-g36j , EUVD-2023-3189

cvss
4.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (XSS) or further attacks. This flaw is the result of an incomplete fix for CVE-2020-10748.

Patch / fix

  • maven org.keycloak:keycloak-services 23.0.3
  • Red Hat Red Hat build of Keycloak 22 22-6, 22-9, 22.0.7-1
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 7 0:18.0.11-2.redhat_00003.1.el7sso, 0:18.0.12-1.redhat_00001.1.el7sso
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 8 0:18.0.11-2.redhat_00003.1.el8sso, 0:18.0.12-1.redhat_00001.1.el8sso
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 9 0:18.0.11-2.redhat_00003.1.el9sso, 0:18.0.12-1.redhat_00001.1.el9sso
  • Red Hat RHEL-8 based Middleware Containers 7.6-38, 7.6-41, 7.6.6-2
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.12-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.12-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.12-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.12-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.12-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.12-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.11-2.redhat_00003.1.el9sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.11-2.redhat_00003.1.el9sso

red hat advisories RHSA-2024:0800RHSA-2024:0799RHSA-2024:0798RHSA-2023:7855RHSA-2023:7856RHSA-2023:7854

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-6134 updated cvss 4.6

keycloak: reflected XSS via wildcard in OIDC redirect_uri

  • Red Hat Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8 7.6-38, rh-sso-7/sso76-openshift-rhel8 7.6-41, rh-sso-7/sso7-rhel8-operator-bundle 7.6.6-2
    fixed: vendor fix RHSA-2023:7857
  • Red Hat build of Keycloak 22 rhbk/keycloak-rhel9 22-6, rhbk/keycloak-rhel9-operator 22-9, rhbk/keycloak-operator-bundle 22.0.7-1
    fixed: vendor fix RHSA-2023:7861
  • Red Hat build of Keycloak 22.0.7
    fixed: vendor fix RHSA-2023:7860
  • Red Hat Single Sign-On 7
    fixed: vendor fix RHSA-2024:0804
  • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak 18.0.11-2.redhat_00003.1.el7sso, rh-sso7-keycloak 18.0.12-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 18.0.11-2.redhat_00003.1.el7sso, rh-sso7-keycloak-server 18.0.12-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2023:7854
  • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak 18.0.11-2.redhat_00003.1.el8sso, rh-sso7-keycloak 18.0.12-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 18.0.11-2.redhat_00003.1.el8sso, rh-sso7-keycloak-server 18.0.12-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2023:7856
  • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak 18.0.11-2.redhat_00003.1.el9sso, rh-sso7-keycloak 18.0.12-1.redhat_00001.1.el9sso, rh-sso7-keycloak-server 18.0.11-2.redhat_00003.1.el9sso, rh-sso7-keycloak-server 18.0.12-1.redhat_00001.1.el9sso
    fixed: vendor fix RHSA-2023:7855
  • Red Hat Single Sign-On 7.6.6
    fixed: vendor fix RHSA-2023:7858

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • access.redhat.com https://access.redhat.com/errata/RHSA-2023:7857 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 4.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<23.0.3
23.0.3

Affected products

  • Red Hat Red Hat build of Keycloak 22
  • Red Hat Red Hat build of Keycloak 22.0.7
  • Red Hat Red Hat Single Sign-On 7
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 7
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 8
  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 9
  • Red Hat RHEL-8 based Middleware Containers
  • Red Hat Single Sign-On 7.6.6

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
  • CWE-75 Failure to Sanitize Special Elements into a Different Plane

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.