This vulnerability (CVE-2026-7498) in DernekWeb is a stored cross-site scripting (CWE-79) issue caused by improper input neutralization during web page generation. It allows attackers to inject malicious scripts that persist on the affected web application, potentially leading to full compromise of user sessions, data theft, or other malicious actions. The vulnerability affects all versions of DernekWeb up to 30122025. The CVSS 3.1 base score is 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating network exploitable with low attack complexity, no privileges required, user interaction needed, and high impact on confidentiality, integrity, and availability. No patch or official remediation is currently documented.

Successful exploitation of this stored XSS vulnerability can lead to execution of arbitrary scripts in the context of affected users, potentially resulting in theft of sensitive information, session hijacking, or other malicious activities impacting confidentiality, integrity, and availability. The high CVSS score reflects these serious impacts. There are no known active exploits reported yet.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider applying web application firewall (WAF) rules to detect and block XSS payloads and follow best practices for input validation and output encoding where possible. Monitor vendor channels for updates and patches.