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Medium · 4.3 CVE-2026-45387 EUVD-2026-30628GHSA-h2cw-7qw9-56xrPYSEC-2026-2728

Open WebUI: Sharing models for others to use (read permission) also exposes model details (system prompt leakage)

Published May 15, 2026 · Updated May 15, 2026 · Assigned by GitHub_M

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, when setting model permissions so that a group has read access to it, intending for other users to use it, those users also can read the model's system prompt. However users may consider their system prompt confidential, so this is considered a security issue. This vulnerability is fixed in 0.9.5.

Affected products

VendorProductAffectedFixed
open-webui open-webui < 0.9.5 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI open-webui < 0.9.5 0.9.5 GHSA-h2cw-7qw9-56xr

References