IDOR in TelegAI Chat Component

Successful exploitation allows unauthorized modification of other users' conversations, compromising integrity of chat data and trust in the platform. Because malicious content and XSS payloads can be injected into chats, the vulnerability can be leveraged for phishing, user impersonation/spoofing, and account hijacking when victims view the injected content in a vulnerable client context. Depending on how chat content is rendered and what session context is available to the victim, this may also result in theft of session material or other sensitive user actions performed in the victim's browser.

Until a full fix is deployed, restrict exposure of vulnerable chat endpoints where possible, increase monitoring for anomalous access to conversation identifiers, and log/alert on cross-user conversation modification attempts. Apply temporary server-side validation to reject requests referencing conversation objects not owned by the authenticated user. Reduce XSS impact by enforcing strict output encoding, deploying a restrictive Content Security Policy, and limiting dangerous HTML/script rendering in chat content. Users and administrators should review for suspicious messages and signs of unauthorized conversation edits or phishing content.

Implement server-side object-level authorization checks on all chat conversation access and modification operations so that users can only read or alter conversation objects they are explicitly permitted to access. Eliminate reliance on client-supplied object identifiers without authorization validation. Review all chat APIs and endpoints for similar IDOR patterns. In addition, ensure chat content is safely handled with robust output encoding/sanitization to prevent stored or reflected XSS through message content. After fixing, rotate or invalidate active sessions if account hijacking is suspected and audit conversation records for unauthorized tampering.