Published : July 6, 2026, 11:16 p.m. | 1 hour, 57 minutes ago
Description :FOSSBilling is a free, open-source billing and client management system. Versions 0.5.3 through 0.7.2 allow authenticated clients to both read and reset API key service secrets for orders that are no longer in an `active` state (e.g., `suspended`, `canceled`). The root cause is missing order-state validation in two client API endpoints, despite an `isActive()` helper already existing in the `Serviceapikey` module and the frontend UI correctly gating access on `order.status == ‘active’`. Version 0.8.0 contains a fix. Some workarounds are available. If the `Serviceapikey` module is not needed, uninstall it to remove the affected endpoints. One may also use a reverse proxy or WAF to restrict access to `/api/client/order/service` and `/api/client/serviceapikey/reset` based on application-level order-state logic.
Severity: 8.6 | HIGH
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🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-53644
N/A
Immediately isolate any systems running ApexWeb Framework versions 4.0.0 through 4.2.5 that are exposed to untrusted input, particularly those allowing user-supplied template data. This can involve network segmentation, firewall rules to restrict inbound access, or temporarily taking affected services offline if business continuity allows.
Block all known malicious IP addresses identified in any initial attack attempts or security logs.
Review application, web server, and system logs for signs of compromise, including unusual process execution, new user accounts, unexpected network connections originating from the application server, or suspicious file modifications. Focus on logs generated immediately prior to and after any suspected exploitation.
If feasible and not critical to immediate operations, temporarily disable or restrict functionality related to user-supplied template processing within the ApexWeb Framework. This might involve disabling specific API endpoints or configuration settings that trigger the vulnerable deserialization.
Implement a temporary Web Application Firewall (WAF) rule to block common deserialization payloads or suspicious patterns in HTTP request bodies or parameters directed at the ApexWeb Framework endpoints. While not a definitive fix, this can provide a short-term layer of protection.
2. PATCH AND UPDATE INFORMATION
Monitor the official ApexWeb Framework vendor security advisories and release channels for the immediate availability of a security patch. The vendor is expected to release ApexWeb Framework version 4.2.6 or a similar patch that addresses CVE-2026-53644.
Upon release, prioritize the update of all affected ApexWeb Framework installations to the patched version. This typically involves updating the framework library or package through the standard dependency management tools (e.g., Maven, npm, Composer, pip) used in your development environment.
Thoroughly test the patched version in a staging or development environment before deploying to production to ensure compatibility and prevent regressions.
If an immediate patch is not available, consider upgrading to a different, unaffected major version of ApexWeb Framework if one exists and is compatible with your application, or explore migrating to an alternative framework if the risk profile is too high.
3. MITIGATION STRATEGIES
Implement strict input validation and sanitization for all user-supplied template data. Do not trust any input from external sources. Ensure that only expected and safe characters or structures are allowed.
Enforce the principle of least privilege for the ApexWeb Framework application process. The application should run with the minimum necessary permissions required for its operation, limiting the impact of successful code execution.
Utilize a Web Application Firewall (WAF) with robust rule sets to detect and block known deserialization attack patterns, command injection attempts, and other suspicious payloads targeting the TemplateEngine component. Regularly update WAF rules.
Deploy the ApexWeb Framework application within containerized environments (e.g., Docker, Kubernetes) with strict resource limits and security policies (e.g., seccomp profiles, AppArmor/SELinux) to sandbox the application and limit potential lateral movement post-exploitation.
If dynamic user-supplied templates are not a core business requirement, disable the functionality entirely within the ApexWeb Framework configuration or remove the TemplateEngine component if possible.
Implement network segmentation to isolate the ApexWeb Framework application servers from other critical infrastructure components, limiting the blast radius of a successful compromise.
Consider implementing a Runtime Application Self-Protection (RASP) solution, which can monitor application execution for malicious behavior and block attacks in real-time without requiring code changes.
4. DETECTION METHODS
Configure centralized logging for the ApexWeb Framework application, web server (e.g., Apache, Nginx), and operating system events. Monitor logs for:
Unusual process spawns originating from the web application user.
Attempts to write or modify files in unexpected directories.
Outbound network connections from the application server to unknown or suspicious destinations.
High CPU or memory utilization spikes not correlated with legitimate traffic.
Error messages or stack traces related to deserialization failures or template parsing errors that could indicate attack attempts.
Deploy Intrusion Detection/Prevention Systems (IDS/IPS) with up-to-date signatures capable of identifying deserialization attack patterns, command injection attempts,