Summary
@dapperduckling/keycloak-connector-server has Reflected XSS Vulnerability in Authentication Flow URL Handling
Impact
A Reflected Cross-Site Scripting (XSS) vulnerability was discovered in the authentication flow of the application. This issue arises due to improper sanitization of the URL parameters, allowing the URL bar's contents to be injected and reflected into the HTML page. An attacker could craft a malicious URL to execute arbitrary JavaScript in the browser of a victim who visits the link.
Who is impacted?
Any application utilizing this authentication library is vulnerable. Users of the application are at risk if they can be lured into clicking on a crafted malicious link.
Patches
The vulnerability has been patched in 2.5.5 by ensuring proper sanitization and escaping of user input in the affected URL parameters.
Users are strongly encouraged to upgrade to the following versions:
Workarounds
If upgrading is not immediately possible, users can implement the following workarounds:
- Employ a Web Application Firewall (WAF) to block malicious requests containing suspicious URL parameters.
- Apply input validation and escaping directly within the application’s middleware or reverse proxy layer, specifically targeting the affected parameters.
References
- OWASP Cross-Site Scripting (XSS) Cheat Sheet: https://owasp.org/www-community/attacks/xss/
Impact
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
CVE-2024-53843 has a CVSS score of 8.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.5.5); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2024-53843? CVE-2024-53843 is a medium-severity cross-site scripting (XSS) vulnerability in @dapperduckling/keycloak-connector-server (npm), affecting versions < 2.5.5. It is fixed in 2.5.5. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- How severe is CVE-2024-53843? CVE-2024-53843 has a CVSS score of 8.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of @dapperduckling/keycloak-connector-server are affected by CVE-2024-53843? @dapperduckling/keycloak-connector-server (npm) versions < 2.5.5 is affected.
- Is there a fix for CVE-2024-53843? Yes. CVE-2024-53843 is fixed in 2.5.5. Upgrade to this version or later.
- Is CVE-2024-53843 exploitable, and should I be worried? Whether CVE-2024-53843 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2024-53843 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2024-53843? Upgrade
@dapperduckling/keycloak-connector-serverto 2.5.5 or later.