CVE-2026-45387

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0003
EPSS Percentile 7.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
open-webui/open-webui < 0.9.5
openwebui/open_webui < 0.9.5
pypi/open-webui 0 - 0.9.5PyPI
Published May 15, 2026
Tracked Since May 16, 2026