CVE-2026-35179: AVideo: Unauthenticated Instagram Graph API Proxy via publishInstagram.json.php

April 3, 2026 (updated April 6, 2026)

The SocialMediaPublisher plugin exposes a publishInstagram.json.php endpoint that acts as an unauthenticated proxy to the Facebook/Instagram Graph API. The endpoint accepts user-controlled parameters including an access token, container ID, and Instagram account ID, and passes them directly to the Graph API via InstagramUploader::publishMediaIfIsReady(). This allows any unauthenticated user to make arbitrary Graph API calls through the server, potentially using stolen tokens or abusing the platform’s own credentials.

References

Code Behaviors & Features

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