CVE-2026-4262

Root

Cause

The vulnerability stems from an incorrect authorization check in the HiJiffy Chatbot's API endpoint /api/v1/download//. The server fails to verify that the requesting user is the intended recipient of a message before serving the download. This is classified under CWE-863 (Incorrect Authorization) [1].

Attack

Vector

An attacker can exploit this by simply providing a valid message ID via the ID parameter in the download endpoint. The attack requires no authentication or user interaction, and can be performed over the network with low complexity. The CVSS v4.0 vector confirms that no privileges are required and no user interaction is needed (AV:N/PR:N/UI:N) [1].

Impact

Successful exploitation allows an attacker to download private messages belonging to other users of the same chatbot instance. This violates confidentiality and exposes potentially sensitive conversation data, including any personal or proprietary information exchanged through the chat service [1].

Mitigation

HiJiffy has recommended updating the chatbot to the latest available version, which presumably corrects the authorization logic for the endpoint. Administrators should apply the update as soon as possible. No workaround is detailed in the advisory, but restricting network access to the API or using a WAF rule to block the vulnerable pattern could serve as interim measures [1].