CVE-2026-45395

Open WebUI: Missing `workspace.tools` Authorization Check on Tool Update Endpoint Allows Privilege Escalation to Code Execution

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, the tool update endpoint (POST /api/v1/tools/id/{id}/update) is missing the workspace.tools permission check that is present on the tool create endpoint. This allows a user who has been explicitly denied tool management capabilities ( and who the administrator considers untrusted for code execution ) to replace a tool's server-side Python content and trigger execution, bypassing the intended workspace.tools security boundary. This vulnerability is fixed in 0.9.5.

Affected

open-webui

CVSS v3.1 GITHUB

7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

0.66% chance of exploitation in the next 30 days, 51st percentile

Published

2026-05-15

Updated

2026-05-19

Proof-of-concept exploits (1)

• advisories/GHSA-p4fx-23fq-jfg6

Security advisories

• open-webui/open-webui/security/advisories/GHSA-p4fx-23fq-jfg6

References

• CVE Record
• NVD entry