CVE-2023-33763 in simpleRedak
Summary
by MITRE • 06/02/2023
eMedia Consulting simpleRedak up to v2.47.23.05 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the component /scheduler/index.php.
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Analysis
by VulDB Data Team • 01/06/2026
The vulnerability identified as CVE-2023-33763 affects eMedia Consulting simpleRedak version 2.47.23.05 and earlier, representing a critical security flaw in the web application's input validation mechanisms. This reflected cross-site scripting vulnerability exists within the scheduler component at the /scheduler/index.php endpoint, which serves as a central administrative interface for managing scheduled tasks and operations. The flaw demonstrates a classic weakness in web application security where user-supplied input is not properly sanitized before being returned to the browser in HTTP responses.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the application's scheduler module. When users interact with the /scheduler/index.php page, the application accepts parameters that are directly reflected back to the client without proper sanitization. This allows malicious actors to inject arbitrary JavaScript code through carefully crafted input fields, which then executes in the context of other users' browsers who visit the affected page. The reflected nature of this vulnerability means that the malicious payload is not stored on the server but rather passed through the application's response mechanism, making it particularly dangerous for targeted attacks.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it provides attackers with a vector for more sophisticated attacks such as credential harvesting, privilege escalation, or even full system compromise. Attackers can craft malicious URLs that, when clicked by authenticated users with administrative privileges, would execute malicious scripts in their browsers. This could lead to unauthorized access to sensitive scheduling data, modification of scheduled tasks, or the potential for lateral movement within the affected network. The vulnerability is particularly concerning given that simpleRedak is designed for content management and scheduling operations, making it a valuable target for attackers seeking persistent access to organizational systems.
Security professionals should implement immediate mitigations including input validation and output encoding at the application level, ensuring all user-supplied data is properly sanitized before being reflected back to browsers. The implementation should follow established security practices such as those outlined in the OWASP Top Ten and CWE-79 which specifically addresses cross-site scripting vulnerabilities. Organizations should also consider implementing Content Security Policy headers to limit the execution of unauthorized scripts, and regular security assessments should be conducted to identify similar issues in other application components. The vulnerability aligns with ATT&CK technique T1566.001 which focuses on spearphishing attachments and links, as attackers could leverage this flaw to deliver malicious payloads through crafted web interactions. Additionally, the remediation efforts should include comprehensive code reviews to identify and address similar input validation gaps across the entire application framework, ensuring that all endpoints properly validate and sanitize user input to prevent similar reflected XSS vulnerabilities from occurring in the future.