CVE-2024-53843
HIGHCVE-2024-53843 is a high-severity (CVSS 8.1) Cross-site Scripting (XSS) vulnerability in @dapperduckling/keycloak-connector-server. O3 Security confirms whether CVE-2024-53843 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Reflected XSS Vulnerability in Authentication Flow URL Handling in @dapperduckling/keycloak-connector-server
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
@dapperduckling/keycloak-connector-servernpmDescription
@dapperduckling/keycloak-connector-server is an opinionated series of libraries for Node.js applications and frontend clients to interface with keycloak. 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. 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. The vulnerability has been patched in version 2.5.5 by ensuring proper sanitization and escaping of user input in the affected URL parameters. Users are strongly encouraged to upgrade. If upgrading is not immediately possible, users can implement the following workarounds: 1. Employ a Web Application Firewall (WAF) to block malicious requests containing suspicious URL parameters. or 2. Apply input validation and escaping directly within the application’s middleware or reverse proxy layer, specifically targeting the affected parameters.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @dapperduckling/keycloak-connector-server | all versions | 2.5.5 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @dapperduckling/keycloak-connector-server. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update @dapperduckling/keycloak-connector-server to 2.5.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-53843 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2024-53843 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2024-53843. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2024-53843 in your dependencies?
O3 detects CVE-2024-53843 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.