Improperly Controlled Modification of Dynamically-Determined Object Attributes in Rocket.Chat - CVE-2026-45687
Published: May 14, 2026
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improperly controlled modification of dynamically-determined object attributes in the sendFileMessage DDP method and upload record handling when processing an attacker-supplied file object. A remote user can modify writable fields such as the storage backend and path on their own upload record to disclose sensitive information.
Exploitation requires an authenticated non-admin account and a cloud-backed upload backend such as Google Cloud Storage or Amazon S3. The victim must have previously generated a data export, and the export path is deterministic from the instance identifier and the victim user ID.