aEnrich｜a+HCM - Téléchargement arbitraire de fichiers

The primary impact of CVE-2026-6835 is the ability for an attacker to upload arbitrary files to the a+HCM server. This can be exploited to inject malicious HTML documents, potentially leading to cross-site scripting (XSS) attacks. Successful exploitation could allow an attacker to execute arbitrary JavaScript code in the context of a user's browser, leading to session hijacking, data theft, or defacement of the application. The lack of authentication required for file upload significantly broadens the attack surface, making this vulnerability particularly concerning. While the description doesn't explicitly mention it, the ability to upload executable files could also lead to remote code execution (RCE) depending on the server's configuration and file permissions.

Organizations using a+HCM in environments with limited security controls are particularly at risk. This includes deployments where file upload functionality is exposed to unauthenticated users or where input validation is inadequate. Shared hosting environments utilizing a+HCM are also at increased risk due to the potential for cross-tenant exploitation.

1. 2026-04-22Disclosure

   disclosure

1. Réservé2026-04-22
2. Publiée2026-04-22
3. EPSS mis à jour2026-04-29

The immediate mitigation for CVE-2026-6835 is to upgrade to a patched version of a+HCM as soon as it becomes available from aEnrich. Until a patch is available, consider implementing strict file upload validation on the server-side to prevent the upload of potentially malicious files. This should include whitelisting allowed file extensions and validating file content. Web Application Firewalls (WAFs) can be configured to block suspicious file upload attempts based on file type, size, and content. Monitor a+HCM server logs for unusual file upload activity, particularly uploads from unknown or untrusted sources. Restrict file upload directories to prevent attackers from writing files outside of the intended upload location.