CVE-2026-35023

Wimi Teamwork On-Premises versions prior to 8.2.0 contain an insecure direct object reference vulnerability in the preview.php endpoint where the item_id parameter lacks proper authorization checks. Attackers can enumerate sequential item_id values to access and retrieve image previews from other users’ private or group conversations, resulting in unauthorized disclosure of sensitive information.

More information : https://www.vulncheck.com/advisories/wimi-teamwork-on-premises-idor-via-preview-php