Authorization Bypass Through User-Controlled Key Affecting open-webui package, versions [,0.8.6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published30 Mar 2026
- disclosed27 Mar 2026
- creditInar1Dev
Introduced: 27 Mar 2026
CVE-2026-28788 (opens in a new tab)How to fix?
Upgrade open-webui to version 0.8.6 or higher.
Overview
open-webui is an Open WebUI
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key through the process_files_batch endpoint lacking proper ownership verification. An attacker can overwrite files belonging to other users and manipulate the content served to downstream processes by submitting crafted requests with file UUIDs obtained from accessible knowledge bases. This can result in unauthorized modification of data, silent data corruption, and the injection of attacker-controlled content into responses provided to other users.