CVE-2026-23796 identifies a session fixation vulnerability in OpenSolution's Quick.Cart e-commerce platform, specifically confirmed in version 6.7. The vulnerability arises because the application allows a session identifier (session ID) to be set prior to user authentication and does not regenerate or change this session ID after the user logs in. This behavior violates secure session management best practices, enabling an attacker to fix a session ID for a victim before authentication. Once the victim authenticates, the attacker can use the known session ID to hijack the authenticated session, gaining unauthorized access to the victim's account and potentially sensitive data. The vulnerability is classified under CWE-384 (Session Fixation). The CVSS v4.0 score is 4.8 (medium severity), with an attack vector of local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), no user interaction required (UI:P), and low impact on confidentiality and integrity. The vendor was notified early but has not disclosed the full range of affected versions or provided patches. Only version 6.7 has been tested and confirmed vulnerable, but other versions may also be at risk. No known exploits have been reported in the wild, but the vulnerability poses a credible risk to session security in affected deployments.

For European organizations, especially those operating e-commerce platforms using Quick.Cart 6.7, this vulnerability can lead to session hijacking attacks. Attackers can impersonate legitimate users, potentially accessing personal data, order histories, payment information, and administrative functions if the victim has elevated privileges. This compromises confidentiality and integrity of user accounts and can result in financial loss, reputational damage, and regulatory non-compliance under GDPR due to unauthorized data access. The medium severity reflects moderate impact and exploitation difficulty, but the risk increases in environments where session fixation protections are weak or where user sessions are long-lived. The lack of vendor patches means organizations must proactively implement mitigations. The threat is particularly relevant for European countries with significant e-commerce activity and Quick.Cart adoption, where attackers may target customers or administrators to gain unauthorized access.

1. Implement immediate session ID regeneration upon user authentication to prevent session fixation. 2. Review and update session management logic to ensure session IDs cannot be set or fixed before login. 3. Enforce secure cookie attributes such as HttpOnly, Secure, and SameSite to reduce session theft risks. 4. Monitor web server and application logs for suspicious session activity or repeated session ID usage. 5. Educate users to avoid clicking on suspicious links that could set malicious session IDs. 6. If possible, upgrade to a newer Quick.Cart version once the vendor releases a patch addressing this vulnerability. 7. Employ Web Application Firewalls (WAFs) with custom rules to detect and block session fixation attempts. 8. Conduct penetration testing focused on session management to identify and remediate similar issues. 9. Limit session lifetime and implement inactivity timeouts to reduce window of exploitation. 10. Maintain an incident response plan to quickly address any detected session hijacking incidents.