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    CVE-2023-6134

    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.

    Published:Nov 14, 2023
    Last Modified:Feb 25, 2026
    EPS:Dec 14, 2023
    EPSS Score:0.01902
    CVSS Score:4.6

    Affected Products

    Vendor
    Redhat
    Product
    Build Keycloak
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Keycloak
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Openshift Container Platform For Power
    Vendor
    Redhat
    Product
    Openshift Container Platform Ibm Z Systems
    Vendor
    Redhat
    Product
    Red Hat Single Sign On
    Vendor
    Redhat
    Product
    Rhosemc
    Vendor
    Redhat
    Product
    Single Sign-on

    Exploits

    https://access.redhat.com/errata/RHSA-2023:7857https://access.redhat.com/errata/RHSA-2023:7857

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-105 HTTP Request Splitting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-273 HTTP Response Smuggling
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-34 HTTP Response Splitting
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-51 Poison Web Service Registry
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-591 Reflected XSS
    CAPEC-592 Stored XSS
    CAPEC-6 Argument Injection
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-83 XPath Injection
    CAPEC-84 XQuery Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-89298 (CVSS 4.9) — A flaw was found in the Dynamic Client Registration service of Keycloak, an open-source identity and access ma…
    CVE-2026-88770 (CVSS 6.5) — A flaw was found in the Device Authorization Grant flow of Keycloak, an identity and access management solutio…
    CVE-2026-19729 (CVSS 4.9) — A flaw was found in the key provider component of the keycloak-services library, which is the core engine for …
    CVE-2026-17615 (CVSS 7.5) — A flaw was found in RESTEasy's SourceProvider. This vulnerability allows an unauthenticated attacker to perfor…
    CVE-2026-82968 (CVSS 6.4) — A flaw was found in the first-broker-login flow of the Keycloak identity management service. When a user links…
    CVE-2026-19611 (CVSS 7.4) — A flaw was found in WildFly Elytron. Password hashing and verification normalize input with Unicode NFKC, whic…
    CVE-2026-15571 (CVSS 7.3) — A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-sourc…
    CVE-2026-79652 (CVSS 5.9) — A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component o…
    CVE-2026-18963 (CVSS 9.1) — A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine fo…
    CVE-2026-19608 (CVSS 5.3) — A flaw was found in the group policy provider of Keycloak authorization services, which is used to manage fine…

    References

    https://access.redhat.com/errata/RHSA-2023:7854
    https://access.redhat.com/errata/RHSA-2023:7855
    https://access.redhat.com/errata/RHSA-2023:7856
    https://access.redhat.com/errata/RHSA-2023:7857
    https://access.redhat.com/errata/RHSA-2023:7858
    https://access.redhat.com/errata/RHSA-2023:7860
    https://access.redhat.com/errata/RHSA-2023:7861
    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-2023-6134
    https://bugzilla.redhat.com/show_bug.cgi?id=2249673
    https://access.redhat.com/errata/RHSA-2023:7854
    https://access.redhat.com/errata/RHSA-2023:7855
    https://access.redhat.com/errata/RHSA-2023:7856
    https://access.redhat.com/errata/RHSA-2023:7857
    https://access.redhat.com/errata/RHSA-2023:7858
    https://access.redhat.com/errata/RHSA-2023:7860
    https://access.redhat.com/errata/RHSA-2023:7861
    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-2023-6134
    https://bugzilla.redhat.com/show_bug.cgi?id=2249673

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High