Keycloak: xss via assertion consumer service url in saml post-binding flow (CVE-2023-6717)
Published Last modified Sources: CVE.org, OSV, EUVD
What is affected, what to do
A flaw was found in the SAML client registration in Keycloak that could allow an administrator to register malicious JavaScript URIs as Assertion Consumer Service POST Binding URLs (ACS), posing a Cross-Site Scripting (XSS) risk. This issue may allow a malicious admin in one realm or a client with registration access to target users in different realms or applications, executing arbitrary JavaScript in their contexts upon form submission.
Update Keycloak to version 22.0.10, Keycloak to version 24.0.3, Red Hat build of Keycloak 22 to version 22.0.10-1.
- Affected
- Keycloak
lt *..22.0.10 - Keycloak
lt 24.0.0..24.0.3 - Red Hat build of Keycloak 22
lt *..22.0.10-1 - Red Hat build of Keycloak 22
lt *..22-13 - Red Hat build of Keycloak 22
lt *..22-16 - Red Hat RHOSS-1.33-RHEL-8
lt *..1.33.0-5 - Red Hat RHOSS-1.33-RHEL-8
lt *..1.33.0-3
- Keycloak
- Fixed in
- Keycloak
22.0.10 - Keycloak
24.0.3 - Red Hat build of Keycloak 22
22.0.10-1 - Red Hat build of Keycloak 22
22-13 - Red Hat build of Keycloak 22
22-16 - Red Hat RHOSS-1.33-RHEL-8
1.33.0-5 - Red Hat RHOSS-1.33-RHEL-8
1.33.0-3
- Keycloak
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Metrics
6.0
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
6.0
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: CVE.org, OSV, EUVD
0.7 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 53.4
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 57.76 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 6.0 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 6.0
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.7 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 53.4
- High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-79
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
A flaw was found in the SAML client registration in Keycloak that could allow an administrator to register malicious JavaScript URIs as Assertion Consumer Service POST Binding URLs (ACS), posing a Cross-Site Scripting (XSS) risk. This issue may allow a malicious admin in one realm or a client with registration access to target users in different realms or applications, executing arbitrary JavaScript in their contexts upon form submission. This can enable unauthorized access and harmful actions, compromising the confidentiality, integrity, and availability of the complete KC instance.
Source: cvelistv5, NVD (NIST), OSV (Open Source Vulnerabilities), ENISA EUVD
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| — | keycloak |
|
|
| Red Hat | Migration Toolkit for Applications 6 |
|
|
| Red Hat | Migration Toolkit for Applications 7 |
|
|
| Red Hat | Red Hat AMQ Broker 7 |
|
|
| Red Hat | Red Hat build of Apicurio Registry 2 |
|
|
| Red Hat | Red Hat build of Keycloak 22 |
|
|
| Red Hat | Red Hat build of Keycloak 22.0.10 |
|
|
| Red Hat | Red Hat build of Quarkus |
|
|
| Red Hat | Red Hat Data Grid 8 |
|
|
| Red Hat | Red Hat Decision Manager 7 |
|
|
| Red Hat | Red Hat Developer Hub 1 |
|
|
| Red Hat | Red Hat Fuse 7 |
|
|
| Red Hat | Red Hat JBoss Data Grid 7 |
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 6 |
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 |
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack |
|
|
| Red Hat | Red Hat OpenShift GitOps |
|
|
| Red Hat | Red Hat Process Automation 7 |
|
|
| Red Hat | Red Hat Single Sign-On 7 |
|
|
| Red Hat | RHOSS-1.33-RHEL-8 |
|
|
| Red Hat | RHPAM 7.13.5 async |
|
|
| maven | org.keycloak:keycloak-services |
|
|
Vendors and products
- Red Hat Migration Toolkit For Applications 6
- Red Hat Migration Toolkit For Applications 7
- Red Hat Red Hat Amq Broker 7
- Red Hat Red Hat Build Of Apicurio Registry 2
- Red Hat Red Hat Build Of Keycloak 22
- Red Hat Red Hat Build Of Keycloak 22.0.10
- Red Hat Red Hat Build Of Quarkus
- Red Hat Red Hat Data Grid 8
- Red Hat Red Hat Decision Manager 7
- Red Hat Red Hat Fuse 7
- Red Hat Red Hat Jboss Data Grid 7
- Red Hat Red Hat Jboss Enterprise Application Platform 6
Weakness classes (CWE)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Base
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Entry at MITRE CWE-79
References & sources
- github.comkeycloak/keycloak/security/advisories/GHSA-8rmm-gm28-pj8qweb
- NVD (NIST)vuln/detail/CVE-2023-6717advisory
- access.redhat.comRHSA-2024:1353web, Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2024:1867web, Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2024:1868web, Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2024:2945web, Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2024:4057web, Vendor advisory, x_refsource_REDHAT
- access.redhat.comsecurity/cve/CVE-2023-6717web, Vulnerability database, x_refsource_REDHAT
- bugzilla.redhat.comRHBZ#2253952web, Issue tracking, x_refsource_REDHAT
- github.comkeycloak/keycloakpackage
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedRed Hat
1 individual change: Affected versions (publisher)
Show the original change
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2023/6xxx/CVE-2023-6717.json">CVE-2023-6717</a>Source identifier: secalert@redhat.com
Record modifiedRed Hat
Show 15 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2023/6xxx/CVE-2023-6717.json">CVE-2023-6717</a>Reference added —https://access.redhat.com/errata/RHSA-2024:1353Reference added —https://access.redhat.com/errata/RHSA-2024:1867Reference added —https://access.redhat.com/errata/RHSA-2024:1868Reference added —https://access.redhat.com/errata/RHSA-2024:2945Reference added —https://access.redhat.com/errata/RHSA-2024:4057Reference added —https://access.redhat.com/security/cve/CVE-2023-6717Reference added —https://bugzilla.redhat.com/show_bug.cgi?id=2253952Reference removed https://access.redhat.com/errata/RHSA-2024:1353—Reference removed https://access.redhat.com/errata/RHSA-2024:1867—Reference removed https://access.redhat.com/errata/RHSA-2024:1868—Reference removed https://access.redhat.com/errata/RHSA-2024:2945—Reference removed https://access.redhat.com/errata/RHSA-2024:4057—Reference removed https://access.redhat.com/security/cve/CVE-2023-6717—Reference removed https://bugzilla.redhat.com/show_bug.cgi?id=2253952—Source identifier: secalert@redhat.com
Record modifiedCVE Program
Show 12 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://access.redhat.com/errata/RHSA-2024:1867Reference added —https://access.redhat.com/errata/RHSA-2024:1868Reference added —https://access.redhat.com/errata/RHSA-2024:2945Reference added —https://access.redhat.com/errata/RHSA-2024:4057Reference added —https://access.redhat.com/security/cve/CVE-2023-6717Reference added —https://bugzilla.redhat.com/show_bug.cgi?id=2253952Reference removed https://access.redhat.com/errata/RHSA-2024:1867—Reference removed https://access.redhat.com/errata/RHSA-2024:1868—Reference removed https://access.redhat.com/errata/RHSA-2024:2945—Reference removed https://access.redhat.com/errata/RHSA-2024:4057—Reference removed https://access.redhat.com/security/cve/CVE-2023-6717—Reference removed https://bugzilla.redhat.com/show_bug.cgi?id=2253952—Source identifier: af854a3a-2127-422b-91ae-364da2661108
Record modifiedRed Hat
1 individual change: Affected versions (publisher)
Show the original change
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) changed …, Red Hat AMQ Broker 7, Red Hat build of Keycloak 22 (+32)…, Red Hat AMQ Broker 7, Red Hat build of Keycloak 22 (+32)Source identifier: secalert@redhat.com
Record modifiedRed Hat
1 individual change: Affected versions (publisher)
Show the original change
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) changed …, Red Hat AMQ Broker 7, Red Hat build of Keycloak 22 (+32)…, Red Hat AMQ Broker 7, Red Hat build of Keycloak 22 (+32)Source identifier: secalert@redhat.com
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<a href="https://intel.neosec.eu/en/cve/CVE-2023-6717"><img src="https://intel.neosec.eu/badge/cve/CVE-2023-6717.svg?lang=en" alt="CVE-2023-6717 – NEOSEC Intel" height="20"></a>