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NVD / CVE Program· CNA redhat

CVE-2023-6134: Keycloak: reflected xss via wildcard in oidc redirect_uri

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 71% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: org.keycloak:keycloak-services (Maven) 23.0.3; rh-sso7-keycloak (Red Hat:red_hat_single_sign_on:7.6::el7) 0:18.0.11-2.redhat_00003.1.el7sso, 0:18.0.12-1.redhat_00001.1.el7sso; rh-sso7-keycloak-server (Red Hat:red_hat_single_sign_on:7.6::el7) 0:18.0.11-2.redhat_00003.1.el7sso, 0:18.0.12-1.redhat_00001.1.el7sso.

Low priority for now. Upgrade to org.keycloak:keycloak-services (Maven) 23.0.3; rh-sso7-keycloak (Red Hat:red_hat_single_sign_on:7.6::el7) 0:18.0.11-2.redhat_00003.1.el7sso, 0:18.0.12-1.redhat_00001.1.el7sso; rh-sso7-keycloak-server (Red Hat:red_hat_single_sign_on:7.6::el7) 0:18.0.11-2.redhat_00003.1.el7sso, 0:18.0.12-1.redhat_00001.1.el7sso or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.4 · v3.1—No exploit Fix available
Published
Dec 14, 2023
Updated
Sep 22, 2026
EPSS
1.3% · 71th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CNA vs NVD score

NVD
5.4
CNA · redhat
4.6
0.8 point gap

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-6134

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatsingle sign-on
redhatenterprise linux
redhatkeycloak
redhatopenshift container platform
redhatopenshift container platform for power
redhatopenshift container platform ibm z systems

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat keycloakbefore 22.0.7
  • redhat openshift container platform4.11
  • redhat openshift container platform4.12
  • redhat openshift container platform for power4.10
  • redhat openshift container platform for power4.9
  • redhat openshift container platform ibm z systems4.10
  • redhat openshift container platform ibm z systems4.9
  • redhat single sign-onall versions
  • redhat single sign-onbefore 7.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat build of Keycloak 22

    • 22.0.7-1 and laternot affected · rpm
    • 22-6 and laternot affected · rpm
    • 22-9 and laternot affected · rpm

  • Red Hat Red Hat build of Keycloak 22.0.7

    • all versionsunknown

  • Red Hat Red Hat Single Sign-On 7

    • all versionsunknown

  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 7

    • 0:18.0.11-2.redhat_00003.1.el7sso and laternot affected · rpm
    • 0:18.0.12-1.redhat_00001.1.el7sso and laternot affected · rpm

  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 8

    • 0:18.0.11-2.redhat_00003.1.el8sso and laternot affected · rpm
    • 0:18.0.12-1.redhat_00001.1.el8sso and laternot affected · rpm

  • Red Hat Red Hat Single Sign-On 7.6 for RHEL 9

    • 0:18.0.11-2.redhat_00003.1.el9sso and laternot affected · rpm
    • 0:18.0.12-1.redhat_00001.1.el9sso and laternot affected · rpm

  • Red Hat RHEL-8 based Middleware Containers

    • 7.6-38 and laternot affected · rpm
    • 7.6.6-2 and laternot affected · rpm
    • 7.6-41 and laternot affected · rpm

  • Red Hat Single Sign-On 7.6.6

    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenorg.keycloak:keycloak-servicesbefore 23.0.323.0.3
Red Hat:red_hat_single_sign_on:7.6::el7rh-sso7-keycloakbefore 0:18.0.11-2.redhat_00003.1.el7sso0:18.0.11-2.redhat_00003.1.el7sso
Red Hat:red_hat_single_sign_on:7.6::el7rh-sso7-keycloakbefore 0:18.0.12-1.redhat_00001.1.el7sso0:18.0.12-1.redhat_00001.1.el7sso
Red Hat:red_hat_single_sign_on:7.6::el7rh-sso7-keycloak-serverbefore 0:18.0.11-2.redhat_00003.1.el7sso0:18.0.11-2.redhat_00003.1.el7sso
Red Hat:red_hat_single_sign_on:7.6::el7rh-sso7-keycloak-serverbefore 0:18.0.12-1.redhat_00001.1.el7sso0:18.0.12-1.redhat_00001.1.el7sso
Red Hat:red_hat_single_sign_on:7.6::el8rh-sso7-keycloakbefore 0:18.0.12-1.redhat_00001.1.el8sso0:18.0.12-1.redhat_00001.1.el8sso
Red Hat:red_hat_single_sign_on:7.6::el8rh-sso7-keycloakbefore 0:18.0.11-2.redhat_00003.1.el8sso0:18.0.11-2.redhat_00003.1.el8sso
Red Hat:red_hat_single_sign_on:7.6::el8rh-sso7-keycloak-serverbefore 0:18.0.11-2.redhat_00003.1.el8sso0:18.0.11-2.redhat_00003.1.el8sso
Red Hat:red_hat_single_sign_on:7.6::el8rh-sso7-keycloak-serverbefore 0:18.0.12-1.redhat_00001.1.el8sso0:18.0.12-1.redhat_00001.1.el8sso
Red Hat:red_hat_single_sign_on:7.6::el9rh-sso7-keycloakbefore 0:18.0.11-2.redhat_00003.1.el9sso0:18.0.11-2.redhat_00003.1.el9sso
Red Hat:red_hat_single_sign_on:7.6::el9rh-sso7-keycloakbefore 0:18.0.12-1.redhat_00001.1.el9sso0:18.0.12-1.redhat_00001.1.el9sso
Red Hat:red_hat_single_sign_on:7.6::el9rh-sso7-keycloak-serverbefore 0:18.0.12-1.redhat_00001.1.el9sso0:18.0.12-1.redhat_00001.1.el9sso
Red Hat:red_hat_single_sign_on:7.6::el9rh-sso7-keycloak-serverbefore 0:18.0.11-2.redhat_00003.1.el9sso0:18.0.11-2.redhat_00003.1.el9sso

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-4039Rhsso-container-image: unsecured management interface exposed to adjecent network
    39Monitor
  • CVE-2019-14843A flaw was found in Wildfly Security Manager, running under JDK 11 or 8, that authorized requests for any requester.
    35Monitor
  • CVE-2023-2585Keycloak: client access via device auth request spoof
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-10695May 26, 2021 · An insecure modification flaw in the /etc/passwd file was found in the redhat-sso-7 container.
    31Monitor
  • ← EarlierCVE-2021-3424Jun 1, 2021 · A flaw was found in keycloak as shipped in Red Hat Single Sign-On 7.4 where IDN homograph attacks are possible.
    21Monitor
  • ← EarlierCVE-2022-2256Sep 1, 2022 · A Stored Cross-site scripting (XSS) vulnerability was found in keycloak as shipped in Red Hat Single Sign-On 7.
    15Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Maven:org.keycloak:keycloak-services23.0.3Package registry (OSV)
red hat:rh-sso7-keycloak0:18.0.11-2.redhat_00003.1.el7sso · Red Hat:red_hat_single_sign_on:7.6::el7Package registry (OSV)
red hat:rh-sso7-keycloak-server0:18.0.11-2.redhat_00003.1.el7sso · Red Hat:red_hat_single_sign_on:7.6::el7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2022-2256469 days apartA Stored Cross-site scripting (XSS) vulnerability was found in keycloak as shipped in Red Hat Single Sign-On 7.
    15Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (12 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records