CVE-2026-8500 affects versions 0.00 through 0.03 of the Web::Passwd Perl module, a CGI application for managing htpasswd files. This vulnerability allows for remote code execution due to insufficient input validation in the 'user' parameter, which is directly passed to the htpasswd command. The lack of sanitization enables attackers to inject arbitrary commands, potentially leading to full system compromise. A fix is pending.
Impact and Attack Scenarios
The primary impact of CVE-2026-8500 is the potential for remote code execution. An attacker can craft a malicious request to the vulnerable Web::Passwd application, injecting arbitrary commands into the htpasswd command line. Successful exploitation allows the attacker to execute commands with the privileges of the web server user, potentially gaining control over the underlying system. This could involve data theft, modification of system files, installation of malware, or even complete system takeover. The blast radius extends to any system hosting a web application utilizing the vulnerable Web::Passwd module, particularly in environments where the web server user has elevated privileges.
Exploitation Context
CVE-2026-8500 is relatively new, published on 2026-05-13. Its EPSS score is pending evaluation. Public proof-of-concept (POC) exploits are currently unknown, but the vulnerability's nature (command injection) suggests that they are likely to emerge. The vulnerability is not currently listed on KEV. Monitor security advisories and vulnerability databases for updates and potential exploitation campaigns.
Threat Intelligence
Exploit Status
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
- Modified
Mitigation and Workarounds
Since a patched version is not yet available, mitigation strategies focus on preventing exploitation. The most immediate step is to disable or remove the Web::Passwd module from any web applications where it is currently deployed. If removal is not possible, implement strict input validation and sanitization on the 'user' parameter within the application code. Consider using a Web Application Firewall (WAF) to filter requests containing potentially malicious commands. Specifically, WAF rules should be configured to block requests containing shell metacharacters (e.g., ;, |, &, $()) in the 'user' parameter. Regularly monitor web server logs for suspicious activity, such as unexpected command execution attempts. Verification after implementing these mitigations involves testing the application with various input strings to ensure that the 'user' parameter is properly sanitized and cannot be exploited for command injection.
How to fix
Actualice el paquete Web::Passwd a una versión corregida. La vulnerabilidad se debe a la falta de validación y escape del parámetro 'user', lo que permite la inyección de comandos. Verifique la documentación del proyecto para obtener información sobre las versiones disponibles y el proceso de actualización.
Frequently asked questions
What is CVE-2026-8500 — RCE in Web::Passwd Perl Module?
CVE-2026-8500 is a Remote Code Execution vulnerability affecting Web::Passwd Perl modules versions 0.00 through 0.03. It arises from insufficient validation of the 'user' parameter, allowing command injection via the htpasswd command.
Am I affected by CVE-2026-8500 in Web::Passwd Perl Module?
If you are using Web::Passwd Perl module versions 0.00 to 0.03 in your web application, you are potentially affected by this vulnerability. Assess your deployments immediately.
How do I fix CVE-2026-8500 in Web::Passwd Perl Module?
A patched version is currently unavailable. Mitigate by disabling/removing the module, implementing strict input validation, and using a WAF to filter malicious requests.
Is CVE-2026-8500 being actively exploited?
While no public exploits are currently known, the vulnerability's nature suggests exploitation is likely. Monitor security advisories and logs for suspicious activity.
Where can I find the official Web::Passwd advisory for CVE-2026-8500?
The official advisory is currently pending. Refer to the National Vulnerability Database (NVD) and security mailing lists for updates and announcements.
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